Question about Altec Lansing VS4121 Speaker

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How to dismantle altec lansing speakers vs 4121

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Posted on Jan 02, 2017

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SOURCE: Altec Lansing VS 4121

It is unlikely that this is a problem with your speakers more likely that it is a problem with the DVD player itself. I would recomend trying another DVD player.

Regards, Andrew

Posted on Sep 17, 2008

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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

Altec Lansing ADA995 Speakers. Can these speakers be used with a home audio system (Technics) or a television (Phillips). JRS Denmark jrschou@live.dk


Hi there , not long ago I was having issues with my VS 2420
I wasn't getting any replies to my queries when requesting help through the web site then someone forwarded me the following
Contact: nicky.cook@alteclansing.com , seems to be manager customer care I got a reply within 24 hrs and a new one was shipped to my UK address within 58 , awesome service ! :D

Feb 24, 2011 | Altec Lansing ADA995 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

1 Answer

ALTEC LANSING-VS-2521 SUB WOOFER AND LEFT SPEAKER DOES NOT FUNCTION


you probably messed something up in the subwofeer amplifier box, try taking them to a repair shop, or at the guarantee place.

another solution would be: you could try and fix them yourself but i don't recommend it.

Jan 15, 2010 | Altec Lansing Audio Players & Recorders

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

1 Answer

Altec Lansing VS 4121


It is unlikely that this is a problem with your speakers more likely that it is a problem with the DVD player itself. I would recomend trying another DVD player.

Regards, Andrew

Sep 17, 2008 | Altec Lansing VS4121 Speaker

1 Answer

Altec lansing


I had the same problem. After numerous calls to Altec Lansing they sent me out a new one. The new one doesn't have the same connector on it. I called tech support only to hear that they discontinued the 621 and don't make parts for it. Sorry, you are probably out of luck.

Oct 26, 2007 | Altec Lansing 621 Computer Speakers

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