Music And Everything To Do With Music

in any shape and form

Input Stereo

without comments

Input Stereo
How can MP3 player into my stereo's input is not () must have a radio?

I was thinkinf it would be nice if an input / jack adapter or To find converters. does something, so there? I have a stereo and I want to input sound from the MP3 player. I thought that would be an audio cable is best, but then I need a method to convert from the headphone jack that the MP3 player has. Any body have an idea? or is there an easier way to download music from an MP3 player to your stereo to get?

if you have a tape deck, you can buy a tape deck adapter. approximately $ 10 CAD.

Pioneer PremierĀ® DEH-P400UB CD/MP3/WMA WAV/AAC/iTunes Car Stereo Receiver with Built-in USB Input and Control

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Channel Vision 1-Input Stereo Modulator


Channel Vision 1-Input Stereo Modulator


$90.00


3.5mm/RCA Dual Input 2.4GHz Wireless HiFi Stereo Headphone for TV PC Laptop MP3


3.5mm/RCA Dual Input 2.4GHz Wireless HiFi Stereo Headphone for TV PC Laptop MP3


$58.95


3-Channel Audio Mixer 2 Stereo RCA Inputs + 1 Mic Input


3-Channel Audio Mixer 2 Stereo RCA Inputs + 1 Mic Input


$46.00


3-Channel Audio Mixer 2 Stereo RCA Inputs + 1 Mic Input


3-Channel Audio Mixer 2 Stereo RCA Inputs + 1 Mic Input


$46.00


Mini 3-Channel Stereo Audio Mixer With 1 Mic Input


Mini 3-Channel Stereo Audio Mixer With 1 Mic Input


$46.00


3-Channel Audio Mixer 2 Stereo RCA Inputs + 1 Mic Input


3-Channel Audio Mixer 2 Stereo RCA Inputs + 1 Mic Input


$46.00


Quality Stereo 1/4


Quality Stereo 1/4″ Headphone Amplifier RCA Input Amp


$39.99


RCA Composite Video and Stereo Audio Splitter, 1 Input 8 Output


RCA Composite Video and Stereo Audio Splitter, 1 Input 8 Output


$33.12


iPac-AFT Direct Audio Input from iPod to Stereo


iPac-AFT Direct Audio Input from iPod to Stereo


$29.99


Bogen BAL2S Stereo Balanced Input NEW


Bogen BAL2S Stereo Balanced Input NEW


$29.99


RCA Composite Video and Stereo Audio Splitter, 1 Input 4 Output


RCA Composite Video and Stereo Audio Splitter, 1 Input 4 Output


$26.17


2 Way Stereo Speaker Selector Switch, 1 input to 2 output, Screw Type


2 Way Stereo Speaker Selector Switch, 1 input to 2 output, Screw Type


$22.07


STEREO COMPONENT SWITCH! GE 4-input AUDIO/VIDEO


STEREO COMPONENT SWITCH! GE 4-input AUDIO/VIDEO


$19.95


3.5mm CAR STEREO AUDIO- iPOD iPHONE INPUT CABLE 100Ft


3.5mm CAR STEREO AUDIO- iPOD iPHONE INPUT CABLE 100Ft


$18.95


Vintage stereo Phono input adapter Plug your CD DVD Tape into Phono input NEW


Vintage stereo Phono input adapter Plug your CD DVD Tape into Phono input NEW


$18.95


10, 1/4


10, 1/4″ STEREO INPUT 6mm PLUG to 1/8″ OUTPUT JACKS


$16.99


10 -1/8


10 -1/8″ Stereo Mini input plug to 1/4″output jacks


$16.99


LOT 10 X 3.5MM 1/8 M-M MALE STEREO AUDIO INPUT CABLE 5'


LOT 10 X 3.5MM 1/8 M-M MALE STEREO AUDIO INPUT CABLE 5′


$15.99


3.5mm Car Stereo Auxiliary Male + Male Input Cable 25FT


3.5mm Car Stereo Auxiliary Male + Male Input Cable 25FT


$14.95


3.5mm CAR STEREO AUDIO For iPOD iPHONE INPUT CABLE 75Ft


3.5mm CAR STEREO AUDIO For iPOD iPHONE INPUT CABLE 75Ft


$13.99


10pcs,1/8


10pcs,1/8″ Stereo Mini input plug to 1/4″output jacks


$12.99


10pcs,1/8


10pcs,1/8″ Stereo Mini input plug to 1/4″output jacks


$12.99


10pcs,1/8


10pcs,1/8″ Stereo Mini input plug to 1/4″output jacks


$12.99


75ft 3.5mm Female STEREO AUDIO iPOD iPHONE INPUT CABLE


75ft 3.5mm Female STEREO AUDIO iPOD iPHONE INPUT CABLE


$12.85


Lot 10 of 6ft 3.5mm Stereo Male to Male Cable  for MP3 to Car Aux Input Jack


Lot 10 of 6ft 3.5mm Stereo Male to Male Cable for MP3 to Car Aux Input Jack


$12.69


3.5mm CAR STEREO AUDIO For iPOD iPHONE INPUT CABLE 50Ft


3.5mm CAR STEREO AUDIO For iPOD iPHONE INPUT CABLE 50Ft


$10.99


50ft 3.5mm Female STEREO AUDIO iPOD iPHONE INPUT CABLE


50ft 3.5mm Female STEREO AUDIO iPOD iPHONE INPUT CABLE


$9.95


50 ft 3.5mm 1/8 AUX auxiliary stereo audio input cable


50 ft 3.5mm 1/8 AUX auxiliary stereo audio input cable


$9.95


3.5mm (1/8


3.5mm (1/8″) 5 female audio stereo 5:1 distributor 1 input to 5 output speaker


$9.95


3.5mm CAR STEREO AUDIO For iPOD iPHONE INPUT CABLE 25Ft


3.5mm CAR STEREO AUDIO For iPOD iPHONE INPUT CABLE 25Ft


$8.99


FM Antenna For most Vintage Stereos & Radios with 300 Ohm input


FM Antenna For most Vintage Stereos & Radios with 300 Ohm input


$8.99


FM Antenna For most Vintage Stereos 75 & 300 Ohm input


FM Antenna For most Vintage Stereos 75 & 300 Ohm input


$8.99


25ft 3.5mm Female STEREO AUDIO iPOD iPHONE INPUT CABLE


25ft 3.5mm Female STEREO AUDIO iPOD iPHONE INPUT CABLE


$8.75


New Yellow 3 Output 1 Input Av Rca Switcher Splitter W/ Cable Gaming Stereo DVD


New Yellow 3 Output 1 Input Av Rca Switcher Splitter W/ Cable Gaming Stereo DVD


$8.75


New Yellow 3 Output 1 Input Av Rca Switcher Splitter W/ Cable Gaming Stereo DVD


New Yellow 3 Output 1 Input Av Rca Switcher Splitter W/ Cable Gaming Stereo DVD


$7.87


Lot 5 of 6ft 3.5mm Stereo Male to Male Cable  for MP3 to Car Aux Input Jack


Lot 5 of 6ft 3.5mm Stereo Male to Male Cable for MP3 to Car Aux Input Jack


$7.69


3.5mm Car Stereo Auxiliary Male to Male Input Cable 6FT


3.5mm Car Stereo Auxiliary Male to Male Input Cable 6FT


$6.99


3.5mm Car Stereo Auxiliary Male to Male Input Cable 6FT


3.5mm Car Stereo Auxiliary Male to Male Input Cable 6FT


$6.99


25 ft 3.5mm 1/8 auxiliary aux stereo audio input cable


25 ft 3.5mm 1/8 auxiliary aux stereo audio input cable


$6.95


2 PACK 1/8


2 PACK 1/8″ 3.5 MM MALE TO 1/4″ TRS FEMALE INPUT STEREO ADAPTER / MINI PIN /2621


$6.30


12Ft 3.5mm 1/8


12Ft 3.5mm 1/8″ CAR STEREO AUDIO INPUT AUX CABLE 12′


$6.25


4 1/8 3.5mm MALE TO 1/4 TRS FEMALE INPUT STEREO ADAPTER


4 1/8 3.5mm MALE TO 1/4 TRS FEMALE INPUT STEREO ADAPTER


$6.00


12 ft 3.5mm 1/8 auxiliary aux stereo audio input cable


12 ft 3.5mm 1/8 auxiliary aux stereo audio input cable


$5.95


3.5mm aux input cable 2pcs lot  to connect ipod to cars radio home stereo


3.5mm aux input cable 2pcs lot to connect ipod to cars radio home stereo


$5.49


3.5mm aux input cable to connect ipod to cars radio and home stereo 2pcs lot


3.5mm aux input cable to connect ipod to cars radio and home stereo 2pcs lot


$5.49


3.5mm CAR STEREO AUDIO For iPOD iPHONE INPUT CABLE 12Ft


3.5mm CAR STEREO AUDIO For iPOD iPHONE INPUT CABLE 12Ft


$4.99


6' 3.5mm 1/8 auxiliary car aux stereo audio input cable


6′ 3.5mm 1/8 auxiliary car aux stereo audio input cable


$4.95


6Ft 3.5mm AUXILIARY CAR STEREO AUDIO AUX INPUT CABLE 6'


6Ft 3.5mm AUXILIARY CAR STEREO AUDIO AUX INPUT CABLE 6′


$4.95


GOLD IPOD CAR STEREO AUDIO CABLE CORD WIRE 3.5MM 1/8


GOLD IPOD CAR STEREO AUDIO CABLE CORD WIRE 3.5MM 1/8″ AUX INPUT WHITE JACK PLUG


$4.17


2x Double 90 Degree Angle 3.5mm Stereo Plug Audio Cable / Cord For AUX MP3 Input


2x Double 90 Degree Angle 3.5mm Stereo Plug Audio Cable / Cord For AUX MP3 Input


$3.99


PREMIUM Male 3.5mm Car Stereo Cable AUX Input iPod mp3


PREMIUM Male 3.5mm Car Stereo Cable AUX Input iPod mp3


$3.99


12ft 3.5mm Female STEREO AUDIO iPOD iPHONE INPUT CABLE


12ft 3.5mm Female STEREO AUDIO iPOD iPHONE INPUT CABLE


$3.95


2' 3.5mm 1/8 auxiliary car aux stereo audio input cable


2′ 3.5mm 1/8 auxiliary car aux stereo audio input cable


$3.95


2 1/8 3.5mm MALE TO 1/4 TRS FEMALE INPUT STEREO ADAPTER


2 1/8 3.5mm MALE TO 1/4 TRS FEMALE INPUT STEREO ADAPTER


$3.95


1/8


1/8″ 3.5 MM MALE TO 1/4″ TRS FEMALE INPUT STEREO ADAPTER / MINI PIN / 2621


$3.90


GOLD CONNECT IPOD TO CAR STEREO AUDIO CABLE CORD WIRE 3.5MM 1/8


GOLD CONNECT IPOD TO CAR STEREO AUDIO CABLE CORD WIRE 3.5MM 1/8″ AUX INPUT JACK


$3.74


3.5mm CAR STEREO AUDIO For iPOD iPHONE INPUT CABLE 6Ft.


3.5mm CAR STEREO AUDIO For iPOD iPHONE INPUT CABLE 6Ft.


$3.69


6FT MINI STEREO AUDIO CABLE,CONNECT PORTABLE AUDIO DEVICES TO STEREO INPUT


6FT MINI STEREO AUDIO CABLE,CONNECT PORTABLE AUDIO DEVICES TO STEREO INPUT


$3.50


PCK 10 - 1/4


PCK 10 – 1/4″ INPUT STEREO PLUG TO 1/8″ OUTPUT JACKS


$3.50


PCK 10 - 1/4


PCK 10 – 1/4″ INPUT STEREO PLUG TO 1/8″ OUTPUT JACKS


$3.50


PCK 10 - 1/4


PCK 10 – 1/4″ INPUT STEREO PLUG TO 1/8″ OUTPUT JACKS


$3.50


6ft 3.5mm Female STEREO AUDIO iPOD iPHONE INPUT CABLE


6ft 3.5mm Female STEREO AUDIO iPOD iPHONE INPUT CABLE


$3.45


3.5mm aux input cable to connect ipod to cars radio and home stereo


3.5mm aux input cable to connect ipod to cars radio and home stereo


$3.29


3.5mm Auxiliary input cable to connect ipod to cars radio and home stereo


3.5mm Auxiliary input cable to connect ipod to cars radio and home stereo


$3.29


3.5mm Auxiliary  aux input cable to connect ipod to cars radio and home stereo


3.5mm Auxiliary aux input cable to connect ipod to cars radio and home stereo


$3.29



Naxa AC/DC NPB-246 Portable MP3/CD Player with AM/FM Stereo Radio & USB Input


Naxa AC/DC NPB-246 Portable MP3/CD Player with AM/FM Stereo Radio & USB Input


$34.49


Naxa AC/DC Portable MP3/CD Player with AM/FM Stereo Radio & USB Input. Top Loading MP3/CD Player. 2 Way Power: DC Battery Power & AC Power.

Boss 640CA Car CD/MP3 Player - 200 W - Single DIN


Boss 640CA Car CD/MP3 Player – 200 W – Single DIN


$235.74


Boss 640CA Car CD/MP3 Player – 200 W – Single DIN

Dual XHDR6435 CD Player


Dual XHDR6435 CD Player


$88.64


Dual XHDR6435 CD Player

Naxa NCD-691 3-inch LCD Display Detachable Stereo AM/FM Radio Multimedia Player


Naxa NCD-691 3-inch LCD Display Detachable Stereo AM/FM Radio Multimedia Player


$118.49


Keep entertainment in your vehicle at all times with this multimedia player from Naxa. This in-dash unit has a 3-inch LCD display, built-in USB input, a SD/MMC card slot and a detachable panel with a carrying case.

PylePro 40 Watts Professional Megaphone/ Bullhorn


PylePro 40 Watts Professional Megaphone/ Bullhorn


$37.49


This powerful megaphone projects your normal voice loud enough so kids will come running. Take the speaker with you to your kids’ games or use to call them in for dinner.

PylePro 50 Watts Professional Piezo Dynamic Megaphone


PylePro 50 Watts Professional Piezo Dynamic Megaphone


$48.49


This powerful megaphone projects your normal voice loud enough so kids will come running. Take the speaker with you to your kids’ games or use to call them in for dinner.

SKQUE 3.5mm M/ M 6-foot Stereo Cable


SKQUE 3.5mm M/ M 6-foot Stereo Cable


$2.99


Small enough to fit in the palm of your hand, this cable is a simple solution to connect your devices together. This cable is compatible with all MP3 players and devices with a 3.5mm input.

PylePro PEMP6 6 Channel Professional Stereo Console Mixer


PylePro PEMP6 6 Channel Professional Stereo Console Mixer


$197.49


6 Input Channels With Xlr ConnectionLow Noise High Precision Microphone Preamplifiers6 Trs 1/4-inch Line Input

Naxa NX-252 AM/FM Stereo and 7-inch TFT LCD Screen Portable DVD Player


Naxa NX-252 AM/FM Stereo and 7-inch TFT LCD Screen Portable DVD Player


$96.99


The Naxa NX-252 portable DVD player is great for a portable DVD experience. With many different power, format, and input options, you are basically free to watch what you want, when you want it with this DVD player.

Pyramid RBPR2500 Stereo Control Pre-Amplifier (Refurbished)


Pyramid RBPR2500 Stereo Control Pre-Amplifier (Refurbished)


$67.99


Customize the sound of your stereo with this stereo control pre-amplifier. This pre-amplifier features a five-function equalizer, an input source selector and several input RCA jacks.

6-foot 3.5mm Stereo to 2 RCA Male/ Male Cable


6-foot 3.5mm Stereo to 2 RCA Male/ Male Cable


$2.19


This 3.5mm Stereo to 2 RCA cable supports and connects to the left and right speaker input.

Naxa NSM-436 Digital MP3/CD Micro System with AM/FM Stereo Radio & USB and Card Inputs


Naxa NSM-436 Digital MP3/CD Micro System with AM/FM Stereo Radio & USB and Card Inputs


$65.49


Vertical Loading MP3/CD PlayerAnalog Tuning with Digital Read OutBuilt-in USB Input

Kenwood KAC 7205 Car Amplifier


Kenwood KAC 7205 Car Amplifier


$137.49


A built-in cooling fan and gold-plated RCA inputs help to enhance the high quality sound of this car amplifier from Kenwood. This 2-channel amp also has speaker-level inputs with signal sensing for automatic turn-on.

PylePro 16-channel Power Mixer


PylePro 16-channel Power Mixer


$469.99


Update your audio equipment with PylePro 16-channel power mixerDJ equipment features 16 mono input channels with gold plated XLR balanced inputsUltra low noise discrete mic preamps with +48 v phantom power

Pyle PYD725 Audio Mixer


Pyle PYD725 Audio Mixer


$67.49


DJ equipment is a 2-channel professional mixerAudio equipment has one 1/4-inch DJ mic input Professional mixer has four line RCA inputs

Kinyo 2.0 Portable Speaker System


Kinyo 2.0 Portable Speaker System


$19.99


Connect your iPod nano or 2G iPod shuffle on the cradle with easy 3.5mm stereo input connectionAlternative Auxiliary Input for additional connectivityOperates with batteries, USB power or AC adapter

SKQUE SVGA Monitor Cable with 3.5mm Audio


SKQUE SVGA Monitor Cable with 3.5mm Audio


$6.99


This cable provides a solution for connecting deskptops/notebooks computer to a video display with built-in speakers. This cable provides an ideal solution to use with projectors, flat panel displays, switches, and other video devices with stereo input.

PylePro 3000 Watt x 2 Bridgeable Power Amplifier


PylePro 3000 Watt x 2 Bridgeable Power Amplifier


$239.99


Bridgeable into single speaker mono outputDual RCA and dual combo inputsStereo/Mono/Bridge input selector

Belkin Stereo Dubbing Cable


Belkin Stereo Dubbing Cable


$7.07


Simply connect one set of plugs to the RCA output jacks of the video source, and the other to the input jacks of your component

Nexxtech Ultimate UMS80 Black Portable Speakers for iPod (Refurbished)


Nexxtech Ultimate UMS80 Black Portable Speakers for iPod (Refurbished)


$13.99


This 2.0 portable speaker can be attached to any MP3 player with the provided 3.5mm stereo input cable and also works with portable CD players portable gaming devices and laptops. It is powered through its USB cable, or batteries.

Power Amplified Subwoofer


Power Amplified Subwoofer


$66.99


60 Watts Total Power Output5.25-inch long-throw woofer driver delivers low frequency bassStereo analog (left/right) RCA inputs compatible with TV audio output

Xbox 360 - HD VGA AV Cable + RCA To 3.5MM Adapter - By Eforcity


Xbox 360 – HD VGA AV Cable + RCA To 3.5MM Adapter – By Eforcity


$8.77


Package includes a VGA cable for the Xbox 360 and a 3.5 mm stereo RCA adapter cableHigh quality graphics on your PC monitor / HDTV / TVs / or projectors using the VGA inputHigh quality audio with included stereo connection

PylePro 2500 Watt x 2 Bridgeable Power Amplifier


PylePro 2500 Watt x 2 Bridgeable Power Amplifier


$216.49


Bridgeable into single speaker mono outputDual RCA and dual combo inputsStereo/Mono/Bridge input selector

Pyle RBPLE420P In-Dash 4-Band Parametric Equalizer (Refurbished)


Pyle RBPLE420P In-Dash 4-Band Parametric Equalizer (Refurbished)


$34.99


Customize the sound of your stereo with this in-dash four-band parametric equalizer from Pyle. This equalizer is a half-DIN size and features a 3.5 mm jack, DVD/AUX input selector, sub output control, and unique blue light illumination.

Deluxe XBOX 360 HD 6-foot VGA Cable


Deluxe XBOX 360 HD 6-foot VGA Cable


$8.49


Provides high quality graphics on your PC monitor/HDTV or projector using VGA inputPlay high quality audio with the included stereo connection or utilize the optical audio port for digital sound

PylePro 3000 Watts Amplifier with Crossover (Refurbished)


PylePro 3000 Watts Amplifier with Crossover (Refurbished)


$148.49


This two-channel rack-mountable amp has 4000 watts of power. Each input takes RCA, XLR, or 1/4-inch phono for use in stereo, mono, or bridge mode for maximum output. A clipping LED reminds you to turn it down if your signal is distorted.

Lanzar Vibe 3-way Electronic Crossover Network (Refurbished)


Lanzar Vibe 3-way Electronic Crossover Network (Refurbished)


$49.69


Parallel input switchSubwoofer phase shifter switchSubwoofer stereo/mono switch

DJ-Tech iBoost 202 Portable PA System


DJ-Tech iBoost 202 Portable PA System


$549


280W Max Active Stereo PA SystemiPod docking-recharge during playingUSB input for Plug and Play MP3

3-foot 3.5mm to Dual RCA Cable


3-foot 3.5mm to Dual RCA Cable


$4.49


This Stereo Cable (3.5mm) to RCA (Red, White) provides easy conversion for interchanging your devices. This cable allows connection from PC’s, laptops, MP3 players, and any other 3.5mm compatible devices to standard TV inputs.


JBL Control SB-2 10 Stereo Input Dual Coil Subwoofer


JBL Control SB-2 10 Stereo Input Dual Coil Subwoofer


$299


JBL Control SB-2 10″ Stereo Input Dual Coil Subwoofer

Stereo


Stereo


$12.56


Stereo

Gc16031 - Interface, Audio Input/Output For


Gc16031 – Interface, Audio Input/Output For


$38.29


the Original Usb Audio Adapter! Imic Lets Mac And PC Users Add Stereo Input And Output to Usb Computers Even if They Lack Audio-in or -out Ports. Imic Allows You to Connect Microphones And Other Input Devices to Your Ibook, Powerbook, Powermac or Other Mac or PC Systems. All You Need is a Usb Port. Imic Supports Both Mic And Line Level Inputs Via a Selectable Switch, And Provides a Line-level Output For Connecting Speakers or Headphones. [GC16031] UPC: 085387302589 UNSPC: 26121600 6.3L x 5W x 0.9H 0.15 LB

Peterson SR-EX StroboRack Pro Input Expander


Peterson SR-EX StroboRack Pro Input Expander


$99.99


The Peterson SR-EX StroboRack Pro Input Expander module allows you to add balanced, stereo and mono in/outputs to your existing StroboRack tuner, enabling use with stereo, hybrid, and balanced instrument signals. A built-in DI, footswitch selectable outputs and presets make it a no-brainer for live and studio use.

3.5mm Stereo MP3/MP4 Headphone


3.5mm Stereo MP3/MP4 Headphone


$2.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

3.5mm Stereo Skeleton Headphones


3.5mm Stereo Skeleton Headphones


$3.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

Peterson Sr-Ex Stroborack Pro Input Expander


Peterson Sr-Ex Stroborack Pro Input Expander


$99.99


The Peterson SR-EX StroboRack Pro Input Expander module allows you to add balanced, stereo and mono in/outputs to your existing StroboRack tuner, enabling use with stereo, hybrid, and balanced instrument signals. A built-in DI, footswitch selectable outputs and presets make it a no-brainer for live and studio use.Mono, stereo & balanced In/Outputs Built-in active DI w/ ground lift Channel switching options Preset remote controls

JBL Control SB-2 10 Stereo Input Dual Coil Subwoofer Black


JBL Control SB-2 10 Stereo Input Dual Coil Subwoofer Black


$299


The Control SB-2 subwoofer provides low-frequency reinforcement in subwoofer/satellite systems. The Control SB-2 is ideal for foreground music and music/paging systems in restaurants, retail establishments, theme bars, music cafes, health clubs, and other indoor applications. The unique slot-load vented design provides acoustic low-pass filtering. Compared to traditional bandpass subwoofers, the JBL SB-2 subwoofer offers superior musical clarity and bass impact. The satellite outputs are high-pass filtered, reducing overall system distortion by eliminating the need for the satellite speakers to reproduce frequencies in the low bass range. The satellites operate more efficiently, maintaining excellent midrange clarity and realism in music and paging. The high-pass filtering also allows a greater number of satellite speakers to be paralleled in the system by increasing the impedance the amplifier sees in the subwoofer range. The stereo inputs are 8 ohms each. The combination of the satellite high-pass filtering, the acoustic slot load filtering and a built-in second order low-pass crossover network results in smoother overall system frequency response and virtually eliminates the muddiness typical of other subwoofer/satellite systems by reducing frequency overlap in the low midrange. You can’t go wrong with speakers from the company whose name is synonymous with cinema sound and was voted number one in the recording industry in 1976 (the heyday of recording) by studio professionals. Today, JBL monitors are used by Grammy winners such as Frank Fillipetti (Ray Charles, Korn, Billy Joel, Kiss) and Nate Kunkel (B.B. King, Sting, Crystal Method, Maroon 5).Component: 10″ (250 mm) dual voice coil transducerStereo inputs with high-pass outputs for satellite speakersSlot-load vented bandpass designComplements full-range Control Contractor Series systemsHigh Sensitivity: 100 dB, 1 W, 1 m

Jbl Control Sb-2 10 Stereo Input Dual Coil Subwoofer Black


Jbl Control Sb-2 10 Stereo Input Dual Coil Subwoofer Black


$299


The Control SB-2 subwoofer provides low-frequency reinforcement in subwoofer/satellite systems. The Control SB-2 is ideal for foreground music and music/paging systems in restaurants, retail establishments, theme bars, music cafes, health clubs, and other indoor applications. The unique slot-load vented design provides acoustic low-pass filtering. Compared to traditional bandpass subwoofers, the JBL SB-2 subwoofer offers superior musical clarity and bass impact. The satellite outputs are high-pass filtered, reducing overall system distortion by eliminating the need for the satellite speakers to reproduce frequencies in the low bass range. The satellites operate more efficiently, maintaining excellent midrange clarity and realism in music and paging. The high-pass filtering also allows a greater number of satellite speakers to be paralleled in the system by increasing the impedance the amplifier sees in the subwoofer range. The stereo inputs are 8 ohms each. The combination of the satellite high-pass filtering, the acoustic slot load filtering and a built-in second order low-pass crossover network results in smoother overall system frequency response and virtually eliminates the muddiness typical of other subwoofer/satellite systems by reducing frequency overlap in the low midrange. You can’t go wrong with speakers from the company whose name is synonymous with cinema sound and was voted number one in the recording industry in 1976 (the heyday of recording) by studio professionals. Today, JBL monitors are used by Grammy winners such as Frank Fillipetti (Ray Charles, Korn, Billy Joel, Kiss) and Nate Kunkel (B.B. King, Sting, Crystal Method, Maroon 5).Component: 10″ (250 mm) dual voice coil transducerStereo inputs with high-pass outputs for satellite speakersSlot-load vented bandpass designComplements full-range Control Contractor Series systemsHigh Sensitivity: 100 dB, 1 W, 1 m

HAI Remote Input Faceplate Module


HAI Remote Input Faceplate Module


$27.99


62A10ALCS RIM’s feature a routed IR emitter jack and include a flasher to allow you to use the remote of your source equipment in any room that has a VSC When you plug a music source into a RIM using a standard stereo input jack Place RIM’s in rooms that will have music sources that you wish to share It can be shared with any room that has a Volume-Source Control (VSC) HAI is the first built-in system that uses a Remote Input Module (RIM, shown at left), so music can be located anywhere instead of in an audio rack. RIM’s can be located throughout the house to pick up music from your home theater, kitchen TV, computer, personal music player, satellite radio, Media Center, CD player any source with an audio output. You can even put multiple RIM’s in the same room. Almond Faceplate Module HAI Home Automation, Inc Remote Input Faceplate Module www.homeauto.com

Naxa AC/DC NPB-246 Portable MP3/CD Player with AM/FM Stereo Radio & USB Input


Naxa AC/DC NPB-246 Portable MP3/CD Player with AM/FM Stereo Radio & USB Input


$86.17


Model:NPB-246Top loading MP3/CD playerAM/FM stereo radioBuilt-in USB inputTrack programmable memoryProgram, skip, pause & repeat functionsAux-in jackRotary volume controlTelescopic antenna2 way power: DC battery power & AC power

Roland KC-880 Stereo Keyboard Amplifier


Roland KC-880 Stereo Keyboard Amplifier


$999


The Roland KC-880 Stereo Keyboard Amp is the flagship of the KC amplifier series, and it’s packed with high-performance features. With 5 channels of stereo input (4 stereo channels and stereo aux in), 320W of power and Roland’s popular DSP effects already built in, the KC-880 is a portable powerhouse for keyboards, vocals, and more. The Roland KC-880 Stereo Keyboard Amplifier’s I/O includes an XLR mic input, stereo XLR outputs, a headphone out, and a Stereo Link for chaining it with other KC-880 amps.Stereo keyboard amplifier with five channels of stereo input320W stereo power amplifier12-inch woofers and two horn tweetersDSP effects (Reverb, Chorus, Tremolo, Rotary)Flexible I/O (XLR mic input, stereo XLR line outputs, headphone out), Stereo Link for chaining multiple KC-880sAccessories:Owner’s manualCaster x 4

Roland Kc-880 Stereo Keyboard Amplifier


Roland Kc-880 Stereo Keyboard Amplifier


$999


The Roland KC-880 Stereo Keyboard Amp is the flagship of the KC amplifier series, and it’s packed with high-performance features. With 5 channels of stereo input (4 stereo channels and stereo aux in), 320W of power and Roland’s popular DSP effects already built in, the KC-880 is a portable powerhouse for keyboards, vocals, and more. The Roland KC-880 Stereo Keyboard Amplifier’s I/O includes an XLR mic input, stereo XLR outputs, a headphone out, and a Stereo Link for chaining it with other KC-880 amps.Stereo keyboard amplifier with five channels of stereo input320W stereo power amplifier12-inch woofers and two horn tweetersDSP effects (Reverb, Chorus, Tremolo, Rotary)Flexible I/O (XLR mic input, stereo XLR line outputs, headphone out), Stereo Link for chaining multiple KC-880sAccessories:Owner’s manualCaster x 4

Maxell EB-225 Stereo Earphone


Maxell EB-225 Stereo Earphone


$7.99


190558 20 Hz 23 kHz EB-225 Stereo Earphone Wind-up carrying case Soft-touch rubber cord Soft silicone tips Rated Input: 1 mW Maximum Input: 5 mW Compatible With: All portable music players Dynamic EB-225 EB-225 Stereo Earphone Earbud Earphone Maxell Mini-phone Neodymium Driver Nickel Plated Stereo Wired www.maxell.com

Stereo Microphone Adapter


Stereo Microphone Adapter


$7.99


Highlights:Records high quality stereo sound with left and right microphoneStylish black color designExtremely portable travel size and small weightProvides excellent clarity recording soundIdeal for use with portable audio recording devices with 3.5mm input microphone jackSpecification:Dimensions: 10x7x1.1cmWeight: 0.009kgPackage Contents:1 x Stereo microphone adapter​

JVC HA-F10C Stereo Earphone


JVC HA-F10C Stereo Earphone


$17.99


0.18 oz 20 Hz 20 kHz 47.28″ HA-F10C Stereo Earphone Hard carrying case Maximum Input Capability: 300mW (IEC) Compatibility: MP3 players The HA-F10C is the stereo earphone with convenient hard carrying case. It produces high quality sound with 13.5mm driver unit. Binaural Earbud Earphone HA-F10C HA-F10C Stereo Earphone JVC Stereo Victor Company of Japan, Limited Wired ha-f10c www.jvc.com

Car Stereo Dual  Car Stereo XR4110


Car Stereo Dual Car Stereo XR4110


$66.74


DUAL MECHLESS DIGITAL MEDIA RECEIVER — 60 watts; Features AM/FM receiver without CD, DIN mount, electronic tuning with 30 presets, auto station store, loudness, electronic bass, treble, balance and fader, 3-preset equalizer curves: rock, pop, classic, MP3 and WMA playback, front panel 3.5 mm input, front panel USB input, front panel SD card input, and one pair of RCA output.. Auto Parts Warehouse has extensive Dual Car Stereo catalogs.We are now offering FREE shipping on all Dual Car Stereo orders over $50.00. Our secure dual car stereo catalog is available every hour of everyday. Shop with confidence for all your dual car stereo needs. Dual Car Stereo are In Stock and available today. Save up to 60% off dealer price on your next Dual Car Stereo purchase. Our online catalog contains a wide selection of the OEM and aftermarket parts you need at unbeatable prices

AG-790 AM/FM Stereo Receiver


AG-790 AM/FM Stereo Receiver


$139


Delivers 100 Watts per Channel to 2-Channel Stereo / Digitally-tuned AM&FM Radio with up to 30 Memories / Remote / Phono Input

Fashion Business 3.5mm Stereo Earphone


Fashion Business 3.5mm Stereo Earphone


$3.99


SpecificationSpeaker:10mmImpedance:32ohmSensitivity:116dbEffective frequency band:20Hz-20KHzRated input power:10mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

3.5mm Stereo 804 In-ear Headphone


3.5mm Stereo 804 In-ear Headphone


$5.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

3.5mm Stereo X9 In-ear Headphone


3.5mm Stereo X9 In-ear Headphone


$4.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

Fashion Commercial 3.5mm Stereo Earphone


Fashion Commercial 3.5mm Stereo Earphone


$3.99


SpecificationSpeaker:10mmImpedance:32ohmSensitivity:116dbEffective frequency band:20Hz-20KHzRated input power:10mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

3.5mm Stereo GP-8808 MP3/MP4 Headphone


3.5mm Stereo GP-8808 MP3/MP4 Headphone


$4.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

3.5mm Stereo GNP-38 MP3/MP4 Headphone


3.5mm Stereo GNP-38 MP3/MP4 Headphone


$3.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

3.5mm Stereo GM-217 MP3/MP4 Headphone


3.5mm Stereo GM-217 MP3/MP4 Headphone


$2.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

3.5mm Stereo 2900 In-ear Headphone


3.5mm Stereo 2900 In-ear Headphone


$1.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

3.5mm Stereo Fruit In-ear Headphone


3.5mm Stereo Fruit In-ear Headphone


$1.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

Maxell HP-200 Stereo Headphone


Maxell HP-200 Stereo Headphone


$2.99


1 190318 20 Hz 20 kHz 32 Ohm 48″ Dynamic sound reproduction from all sources Magnet: Anisotropic Ferrite Film: 0.012mm Coil: 13.6mm Channel Balance: < 3 dB Rated Input: 40 mW Maximum Input: 100 mW Lightweight Folding Open-Air Type Stereo Headphones provide dynamic sound reproduction with all portable music players. Feature adjustable locking headband and single entry cord. Impedance: 30mm. Drivers: 32 ohms. Magnet: Anistoropic Ferrite. Film: 0.016mm. Coil: 13.6mm. Sensitivity: 100 dB +/- 3dB. Channel Balance: 3dB. Rated Input: 40mW. Maximum Input: 100 mW. Frequency Response: 20Hz – 22,000Hz. Plug: 3.5mm Straight Plug. Cord Length: 4 ft. Dynamic HP-200 HP-200 Stereo Headphone Headphone Lifetime Maxell Mini-phone Nickel Plated Open Stereo Wired www.maxell.com

Maxell EB-125 Stereo Earphone


Maxell EB-125 Stereo Earphone


$2.99


0.53″ 1 190568 20 Hz 23 kHz 32 Ohm 36″ Magnet: Anisotropic Ferrite Film: 0.009mm Coil: 7.4mm Channel Balance: < 3 dB Rated Input: 1 mW Maximum Input: 5 mW EB-125 Stereo Earphone feature 3′ soft-touch rubber cord, 3.5mm nickel-plated L-plug, a 20-23,000 Hz frequency response, < 3 dB channel balance and 13.5mm drivers. Dynamic earbuds are lightweight for extended use. Dynamic EB-125 EB-125 Stereo Earphone Earbud Earphone Lifetime Maxell Mini-phone Nickel Plated Not Applicable Stereo Wired www.maxell.com

Car Stereo Dual  Car Stereo XML8100


Car Stereo Dual Car Stereo XML8100


$151.74


DUAL IN-DASH MECHLESS IPOD DOCKING STATION — Features 2 pairs of RCA outputs, 2-character dot matrix LCD outside, 4-character LCD inside, rear aux input with included iplug, steering wheel interface input, infrared remote control, 240 watts total power, adjustable side supports, charges iPod while docked, control from iPod or head unit, AM and FM tuner with 30 presets, expansion module slot and supports every iPod except Shuffle; Bluetooth ready BTM60 equalizer required.. Auto Parts Warehouse has extensive Dual Car Stereo catalogs.We are now offering FREE shipping on all Dual Car Stereo orders over $50.00. Our secure dual car stereo catalog is available every hour of everyday. Shop with confidence for all your dual car stereo needs. Dual Car Stereo are In Stock and available today. Save up to 60% off dealer price on your next Dual Car Stereo purchase. Our online catalog contains a wide selection of the OEM and aftermarket parts you need at unbeatable prices

Sima SVS-14 4 Input A/V Selector


Sima SVS-14 4 Input A/V Selector


$17.99


4 x A/V In Compact size to fit into any system No power required for easy installation 0.125″ jack on front to feed audio signals to wireless systems Works with stereo audio and both composite and S-video signals Simplifies A/V system wiring by providing single distribution point Easy to use: just press the input desired Ideal for anybody who is constantly plugging and unplugging cables Works both forward and reverse directions: 4 in and 1 out or 1 input and 4 outputs (only 1 Output active at a time) going to one of 4 devices The Model SVS-14 Audio Video Switcher lets you add additional components to your TV and home theater system by providing additional A/V inputs to your system. A/V Selector Audio In Composite Video In Home Theater S-Video In SVS-14 SVS-14 4 Input A/V Selector Sima Sima Products Corporation TV www.simacorp.com

Roland KC-880 Stereo Keyboard Amplifier  886830067709


Roland KC-880 Stereo Keyboard Amplifier 886830067709


$849.15


The Roland KC-880 Stereo Keyboard Amp is the flagship of the KC amplifier series, and it’s packed with high-performance features. With 5 channels of stereo input (4 stereo channels and stereo aux in), 320W of power and Roland’s popular DSP effects already built in, the KC-880 is a portable powerhouse for keyboards, vocals, and more. The Roland KC-880 Stereo Keyboard Amplifier’s I/O includes an XLR mic input, stereo XLR outputs, a headphone out, and a Stereo Link for chaining it with other KC-880 amps.Stereo keyboard amplifier with five channels of stereo input320W stereo power amplifier12-inch woofers and two horn tweetersDSP effects (Reverb, Chorus, Tremolo, Rotary)Flexible I/O (XLR mic input, stereo XLR line outputs, headphone out), Stereo Link for chaining multiple KC-880sAccessories:Owner’s manualCaster x 4

Used Roland Kc-880 Stereo Keyboard Amplifier  886830067709


Used Roland Kc-880 Stereo Keyboard Amplifier 886830067709


$849.15


The Roland KC-880 Stereo Keyboard Amp is the flagship of the KC amplifier series, and it’s packed with high-performance features. With 5 channels of stereo input (4 stereo channels and stereo aux in), 320W of power and Roland’s popular DSP effects already built in, the KC-880 is a portable powerhouse for keyboards, vocals, and more. The Roland KC-880 Stereo Keyboard Amplifier’s I/O includes an XLR mic input, stereo XLR outputs, a headphone out, and a Stereo Link for chaining it with other KC-880 amps.Stereo keyboard amplifier with five channels of stereo input320W stereo power amplifier12-inch woofers and two horn tweetersDSP effects (Reverb, Chorus, Tremolo, Rotary)Flexible I/O (XLR mic input, stereo XLR line outputs, headphone out), Stereo Link for chaining multiple KC-880sAccessories:Owner’s manualCaster x 4

Trendy Stereo Earphones (Pink)


Trendy Stereo Earphones (Pink)


$2.99


SpecificationType: Earphones Connection: Wired Style: In-Ear Features: Earbuds Color: Pink Design: Stylish Input (mm): 3.5 Cable Length (cm): 120 Frequency Response (Hz): 20-20kHz Total RMS Power (mW): 5 Dimensions (cm): 120×21.2 Weight (kg): 0.01Package Contents1 x Trendy Stereo Earphones (Pink)

Trendy Stereo Earphones (Black)


Trendy Stereo Earphones (Black)


$4.39


SpecificationType: Earphones Connection: Wired Style: In-Ear Features: Earbuds Color: Black Design: Classic Input (mm): 3.5 Cable Length (cm): 150 Frequency Response (Hz): 20-20kHz Total RMS Power (mW): 5 Dimensions (cm): 135×1.2×1.2 Weight (kg): 0.053Package Contents1 x Stereo Earphones

Premium Stereo Earphones (Black)


Premium Stereo Earphones (Black)


$2.39


SpecificationType: Earphones Connection: Wired Style: In-Ear Features: Portable Color: Black Design: Classic Input (mm): 3.5 Cable Length (cm): 150 Dimensions (cm): 10x7x1.1 Weight (kg): 0.021Package Contents1 x Premium Stereo Earphones (Black)

Ernie Ball Stereo 25K Ohm Volume Pedal


Ernie Ball Stereo 25K Ohm Volume Pedal


$145


This stereo pedal is designed specifically for instruments with active electronics and buffered effect returns. Use the A input/A output for the left channel and the B input/B output for the right channel. For use as a mono volume pedal, use the A input and A output. For use with stereo cable installations using TRS type stereo plugs, use the B input and B output.

Maxell HB-202 Stereo Headphone


Maxell HB-202 Stereo Headphone


$4.99


1 190317 20 Hz 20 kHz Soft silicone tips for extended wear and comfort Memory headband Soft-touch rubber cord Raised Input: 1 mW Maximum Input: 5 mW Compatibility: Portable stereos Boom boxes Cassette players CD players Stereo Head Buds (HB-202) feature vertical ear entry, memory headband, 4′ soft-touch rubber cord, 12mm drivers, a nickel-plated 3.5mm L-plug, < 3 dB channel balance and 20-22,000 Hz frequency response. Soft silicone tips are designed for extended wear and comfort. Binaural Dynamic HB-202 HB-202 Stereo Headphone Headphone Maxell Mini-phone Neodymium Driver Nickel Plated Over-the-head Stereo Wired www.maxell.com

3.5mm Stereo Coccinella Retractable Cord Headphone


3.5mm Stereo Coccinella Retractable Cord Headphone


$2.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

3.5mm Stereo TM-2 Over-ear Headphone


3.5mm Stereo TM-2 Over-ear Headphone


$13.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m

3.5mm Stereo Stylish Flat line In-ear Headphone


3.5mm Stereo Stylish Flat line In-ear Headphone


$4.99


SpecificationSpeaker:9mmImpedance:16ohmSensitivity:104dbEffective frequency band:20Hz-20KHzRated input power:3mWMax.input power:4mWPlug:3.5mm stereo plugCord length:1m




This is ultimately easy, but before explaining the process I feel it is necessary to provide a warning. Multiple sets of speakers usually can not be hooked directly to a standard audio amplifier without some sort of impedance matching device. This is in reference to those persons whom might want to run speakers in several rooms at the same time (distributed audio). If several sets of speakers are run from one set of speaker terminals the amplifier will usually overheat and shut down, and may blow the output stage (see footnote 1). These remarks do not apply to PA style amplifiers with 25 or 70 volt outputs, which require special speakers with transformers.

The correct solution is to use either an impedance matching speaker selector with the protection enabled, or use impedance matching in wall volume controls. Notice the underline in the sentence above. This is because most speaker selectors are made with a dangerous feature: a button, right in front, to disable the protection. If the switch was in back to prevent accidental deactivation of the speaker protection it would be much better. If the protection is accidentally switched off while running multiple pairs of speakers the amplifier will shut down, may blow output fuses, and very well may damage the output stage of the amplifier. There are really only 2 reasons to turn this switch off, the most relevant being that impedance matching volume controls are being used on ALL pairs of speakers. The other reason would be if only One Pair of speakers are being run, making impedance matching unnecessary. In this event, though, leaving the protection switched in will make only a very small difference to the sound, so why not leave it on?

Remember it this way: only put one speaker per pair of terminals (usually red and black) on the amplifier. Do not try to use a surround amp to feed several rooms with one room on the center, one room on the rear surrounds etc. This is due to the way a surround receiver distributes the sound as you may end up with only the voice in one room and only the music in another! The correct hookup for a surround receiver puts surround sound in the main room and sound from the left and right main speakers is distributed. My recommendation for hooking up a surround receiver is as follows. Run the speaker selector from the front left and front right outputs on the amplifier. Hook your front left & right speakers to the first speaker switch on the speaker selector. You will need to re-balance your surround system by running the pink noise test as the speaker selector will decrease the output to the left and right speakers by a small amount. This allows running the main speakers & the other speakers connected to the speaker selector without one set being louder than the others. If your speaker selector has volume controls, you need to make sure when you use your surround system for movies the volume control is at the same setting it was when doing the pink noise test. You may hook the speaker selector to the ‘b’ speaker switch on the amplifier if speaker volume balance between your main left & right speakers and the rest of the speakers is not an issue.

Another variation is amplifiers with a direct speaker output for zone 2, 3, etc. These are set up to drive 1 pair of speakers, and must be used with impedance matching if more pairs are to be used. The zone outputs allow a second (or third etc) source, for example CD in one room and radio in another.

An impedance matching speaker selector provides multiple outputs from one input, and protects your amplifier from damage. Speaker selectors come with 4-12 outputs. As long as your amp has enough power, you can push as many sets of speakers as you want. Simply connect the speaker selector to your ‘A’ (or ‘B’) outputs and the rest of your speakers on the speaker selector. You can purchase speaker selectors with volume controls for each individual speaker. Another option is in wall impedance matching volume controls, which require no speaker selector. Most of these are set with jumpers at install time, providing the correct matching. If you want to run more pairs of speakers than the speaker selectors or volume controls are made for (usually 12 pairs max. depending on the hardware) you probably want a second amplifier to run the second set of volume controls (or speaker selector) from.

So, what is impedance and impedance matching? (Warning: semi technical material ahead)

The music signal to your speakers is called alternating current (or AC), because it varies polarity and voltage. This is in comparison to a battery, for example which produces a steady, or direct current. You may picture current as the amount of water flowing in a pipe (the wire) and voltage as the water pressure. Alternating current can be imagined as a flow that reverses direction and direct current as a steady flow in one direction. The analogy is not exact but is close enough to get a picture of what is happening. Standard house current in the US reverses direction (polarity) at an interval (or frequency) of 60 times per second, measures as 60 Hz (Hertz). If you visit our site you can see this article with explanatory diagrams included.

Your speakers have a certain amount of resistance to current. Imagine the resistance as a constriction in the pipe, limiting the flow. They have a DC resistance, termed the voice coil resistance, and resistance to AC is called impedance. Resistance and impedance values are measured in Ohms. Impedance is a complex sum of dc resistances, plus the resistance to various AC frequencies caused by capacitance and inductance (normal properties of electrical and electronic devices). It is usually specified for speakers as nominal impedance, and is referenced to particular frequencies . However, Just think of it as resistance to AC for practical purposes. This is usually rated at either 8 or 4 Ohms. Most home amplifiers prefer an 8 ohm impedance. Each time another speaker is added in parallel the impedance is reduced. Visualize several pipes connected together to the same pump, obviously the flow from the pump increases (up to the limit of the pumps capability). The amplifier is the pump. Two 8 ohm speakers reduce the impedance to 4 ohms, four 8 ohm speakers reduce the impedance to 2 ohms, and so forth.

An amplifier expects (most require) a certain amount of resistance to current flow. The lower the impedance, the more current flows through the output stage of a typical amplifier. This usually flows directly through a transistor (or other amplifying device) and damages the transistor or protective resistors in the output stage. If you get lucky it only blows an output stage fuse. The moral of the story is always use an impedance matching speaker selector, (or volume control) and your amplifier will always see a safe impedance load.

1 (footnote)

Why does the amplifier output stage blow? This is due to the nature of a typical amplifier. It must first be clear that an amplifier does not actually make the input signal bigger. What it does is recreate a larger (higher current and voltage) copy of the original signal, and puts that out to the speakers. It makes this copy from the power supply voltage, which is derived from the AC from the wall outlet. This voltage must be first converted to DC. If not done efficiently the amplifier will hum (because it doesn’t know the words). The amplifier controls the power supply voltage by a sort of valve that controls the output voltage and current. These valves (transistors are usual, but may be integrated circuits, vacuum tubes, or other devices) are controlled by the input signal. In response to the input signal, the amplifying device allows more or less current (and/or voltage) flow through it to the output in an exact (hopefully) replica of the input signal. In order to have the majority of speakers work well with an amplifier, it needs a low output impedance (see the text above for a discussion of impedance). If the output impedance is too high, the frequency response will vary with the impedance of the speakers. This means that some sounds will be accented and some diminished from the levels they should be, and this effect will be different with every different set of speakers. In practical terms this means that, with the most commonly used circuit design, when the transistor (or other device) is fully on, it needs to pass almost all the power supply current available through it. This is the tricky part. The current flow is determined largely by the impedance of the speakers connected. Most amplifiers are designed to work with 8 ohm speakers, and may work into 4 ohms reasonably well. Some so called high current amplifiers may work well into 1 ohm. In other words, the amplifiers are designed that when the output transistors are passing the full current and voltage they can take, they are working into an expected value of impedance. When the impedance (ac resistance) of the connected speakers get too low, more current is allowed to pass through the amplifying device than it can take. It either burns up, or blows a fuse, or burns up emitter resistors, or some other form of damage occurs. Fusing often does not react fast enough to save the circuit. So why not design all systems to work into low impedances? Without going too far into it, this can result in huge cost increases. For example, for theoretically ideal performance into most of today’s speaker systems, an amp should double it’s power for every halving of impedance. So for 100 watts into 8 ohms, it must put out 200 into 4 ohms, 400 into 2 ohms, and 800 into one ohm(Remember,this is theoretically ideal, and almost no amplifiers can accomplish an actual doubling of power for a halving of load impedance). Most decent amplifiers today have significantly less than .5 ohms output impedance, so as to perform well with speakers that may drop to low impedances at some frequencies. Our theoretical amp, if made to operate into a .5 ohm load would need to have the capability to put out 1600 watts per channel without damaging anything (in the amplifier!). As you can imagine the cost of a good quality amplifier with this kind of capability is substantial. Now think about this: The average user of this massive amp, with 8 ohm speakers, will only see an average output wattage of 100 watts RMS (RMS stands for Root Mean Square, and is basically an average power measurement which is approximately 70 percent of peak power). For most users this would price the amp out of reach. Some amps are built to this type of standard, for the reason that there are speakers that drop as low as one ohm that sound much better if driven by a very high current amplifier. One such example is the Krell Evolution One, which is a monoblock. This means you need two for stereo. They will only set you back about $25,000 dollars each. For those who might think I am making this up, use google to find prices on Krell monoblocks.

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