Question about Altec Lansing VS4121 Speaker

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Connector problem I just moved. I have an altec lansing 3 pc surround sound system.. I lost the wire where the pc meets the subwoofer

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Just buy a minijack-minijack cable. It's very cheap.

Posted on Sep 15, 2008

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Altec lansing mx5021 pls. give the 9pin wiring diagramthe the color code 9pin going to mainboard.


If you wish to get some details; visit the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/
Type in the brand name of your device, in the search box [at the top right] of the display window and the Search will start at once as you type in, and will show you all the related posts. It will make surf easy.

Jun 11, 2015 | Altec Lansing MX5021 System

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Fix subwoofer


Pop open the back side of the sub and see if the to connections are soldered firmly to the wires/drivers themselves & make sure your system is grounded meaning the 3 pronged plug has to have the 3 post still connected to the power cord. If its broken off as most people do it'll cause that feedback or dull hummmmm noise.

Oct 15, 2013 | Altec Lansing VS4121 Speaker

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Is there a way to use the Altec Lansing VS4121 Subwoofer as a stand alone?


Normally these low end systems components that depend on each other and cannot be interchangeable from other system. So if one of the components (sub woofer or right control satellite speaker) breaks or gets lost the whole system is unusable...
I was in the same situation. Got a sub woofer from VS4121 without original satellite speakers. I acquired satellite speakers from Altec Lansing 251 which used same connectors but the internal wiring was different and incompatible out of the box. Speakers are also glued together so it is impossible to open without damaging it. Not to mention there is no service documentation anywhere..
But if you like electronics you can try to make something based on the information bellow:
Altec Lansing VS4121 connector pinout
If you take the male connector (from right satellite speaker) and look at the pins and number them first row from left to right pins 1-3, second row pins 4-7, the bottom row pins 8-9 and the circle enclosure as 0
0 - Ground
1 - Speaker Right
2 - Treble (seems just like voltage control but may need to be confirmed: Min=0V; Max=voltage from Volume control Pin 9)
3 - Head Set Right
4 - Bass signal (not sure what the exact original design is as I have not opened the speaker) But seems like they use 50K potentiometer and some sort of RC low pass filter configuration. When potentiometer is set to Min it is shorted with ground. When set to Max it is taking signal from Right and Left Head Set (pins 3 and 5) combined through some larger resistors and low pass filter.
5 - Head Set Left
6 - Ground for Head set (grounds 0 and 6 seems to be connected in the subwofer but within the right satelite speaker they seem to be isolated with separate leads to sub)
7 - Power ON/OFF. When OFF or head set jack plugged = 0V; When ON and head set jack unplugged = 5V
8 - 5V Power in
9 - Volume (min=0V; max=5V). It seems they use 50K potentiometer but probably anything >10k should work.
At minimum for standalone sub woofer you will need to implement:
- Power On.Off (switch between pins 8,7)
- Volume control (50k potentiometer (probably anything beteen 10k and 50k will do)between pin 7 and 0 with variable output to pin 9
- Bass control - join two resistors R (I used 7k) and lets call this join point A. Attach other ends of the resistors to pins 3 and 5 respectively. Attach 50k potentiometer (I used 10k) between point A and ground 0. Attach Variable pin of the potentiometer to pin 4 (Bass input signal). Attach capacitor C between Pin 4 and Ground pin 0 (I used Electrolytic 1uF with negative end to ground) . Resistor R and capacitor C should make simple passive low pass filter (Google for formula) that should bypass anf frequency higher than 80-120Hz to ground and feed frequencies lower than 80-120Hz to pin 4.
PS: I managed to hack 251 control satellite speaker to somewhat work with VS 4121 Subwoofer but that is another subject. All electronic parts were salvaged from old broken TV so total cost was $0 but took several days of tinkering for speakers that I could buy used for $10-20 :)

Jun 25, 2012 | Altec Lansing VS4121 Speaker

1 Answer

Need advice on Altec Lansing x5021


Altec Lansing is the best company to buy speakers if you watch movies or listen to music. it hits both deep and a strong bass. These are the best speakers to buy.

Feb 25, 2010 | Altec Lansing MX5021 System

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Connecting an Altec Lansing ADA995 subwoofer system to a stereo


I have this exact Altec Lansing speaker system and I'm currently just using it with my Dell computer. But, I know you don't have to install these speakers to any high powered receiver for good sound quality. The subwoofer has two separate 200 watt RMS combined amplifiers built in for it's single knob controlled dual 6.5" bass drivers and 2-way magnetically shielded satellites, which are amplified together by any source that has an analog or digital volume control. The speakers act as a preamp receiver to any volume or frequency tone level controlled audio source. These input sources can also equalize the speakers receiving input signal for bass, treble or mid-range adjustments. You only need to obtain the proper adapter to hook up all the speakers to your desired component or device. Besides a computer, for example a TV with a variable audio out function or a mp3 player will work. The adapter that i am referring to is similar to what is included with certain 5.1 Logitech brand computer and multimedia speakers specifying gaming console and TV connecting. It has all three color coded 1/8" connector inputs on one end and RCA jack outputs on the other. This can be purchased more easily online then offline at stores such as Ebay for a fairly inexpensive price. However this adapter will not decode true 5.1 surround, but instead give a 5 channel stereo effect. I guess if one was looking for an inexpensive alternative solution to purchasing traditional high end home entertainment audio equipment, the ADA 995s are one of few computer speaker models in my book that can do a decent job.

Jun 19, 2009 | Altec Lansing ADA995 Speaker

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My philips dvd player 5.1 have female ports at back side for audio but i have the sound system of LG which has simple naked wire to connect .


Philips DVP 3256 has 6 outputs which takes in RCA connectors
Altec lansing VS3251 has 3 STEREO outputs.
Buy 3 nos of STEREO (female) to RCA (male) cables
1. Connect the Altec's green wire to first stereo-to-RCA cable. RCA ends to DVP 3256's Front left and Front right
2. Connect the Altec's black wire to second stereo-to-RCA cable. RCA ends to DVP 3256's Rear left and Rear right
3. Connect the Altec's orange wire to third stereo-to-RCA cable. RCA ends to DVP 3256's Centre/Sub woofer. Interchange RCA ends if the Subwoofer sounds dull.

Good Luck

Jan 29, 2009 | Altec Lansing VS3251 Speaker

5 Answers

Subwoofer making load humming noise


The reason for the hum in the Altec Lansing VS4121 speaker system is the stray field of the power supply transformer. This stray field is strong enough to affect the amplifier. All other reasons given by numerous reports on the web do not apply. If you are handy and have got the time you may mitigate the problem by physically moving the amp away from the power supply or turning it 90 degrees. I managed to lift up the amp in my subwoofer by about 50 mm, which was difficult to achieve and did not cure the problem perfectly. I don't see any other way to solve this problem except you feed DC in from the outside and do not use the internal power supply. That would be really odd indeed

Gerhard Weber.

Jan 29, 2009 | Altec Lansing VS4121 Speaker

2 Answers

Cannot connect my surround sound altec lansing system to my compu


The first thing you can do is go to www.retrevo.com to download the manual. Secondly all you have to do is match the colors of the wires to the imports in the back. You have five speakers. Two have gray wires, two have red and one has blue. If you also notice each speaker has two wires. One a solid color, the other striped with black. For instance, put the solid red wire into the red import and the red wire with the black stripe into the black import. Repeat this with all the other wires. The easiest way to hook it up to your computer or laptop is to take one of the aux wires (the wires with the yellow/green/black tips). It doesn't matter which one. Put into you headphone import on your computer or laptop. Then put the other side into the Aux on the subwoofer. Located on the front. Turn on the power on the back. Then hit the aux button on the remote. That should work....
If you have any other questions or need any more help you can contact me brown.faith@rocketmail.com

Jan 22, 2009 | Altec Lansing VS3251 Speaker

1 Answer

Surround wont work



try and download sound softwares from majorgeeks.com.

hope this works.

Jan 05, 2008 | Altec Lansing VS3251 Speaker

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