Question about Altec Lansing VS4121 Speaker

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Altec Lansing VS 4121

My Altec Lansing VS4121  stopped working when i play my dvd. I can only hear very very faint sounds. It is totally fine when i watch tv. So obviously the speakers are not damaged. What could be the problem?

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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 vs4121 speaker boom sound


you may have blown out the speaker or there is a miscommunication between the laptop and the woofer

Jun 15, 2012 | Altec Lansing VS4121 Speaker

1 Answer

Umm I have an altec lansing vs4121 and the subwoofer is kinda loose so if i get stong bass i hear this extra vibrate in my speakers which is really annoying....


Umm, so what's the question? The sub COULD be damaged or it could be reacting to being overdriven. Sometimes resonances form due to room- or nearby surface interactions. Try moving the sub a foot or two in each direction. Or turn the bass down.

Sep 02, 2011 | Altec Lansing VS4121 Speaker

1 Answer

My Altec Lansing VS4121 played excellent sound, even at high volume untill recently. A friend had borrowed them for weeks and I got them back recently. Played music to find out that sound of main woofer...


Hi there,
I think that some wirings inside the main woofer or the tray holding it might have loosed. It could be the speakers were accidentally dropped or anything.
You can bring it to a local store Best Buy, Staples, etc. have it checked by one of them technicians or to see if it can be put back to it's place. I'm no speakers expert but that's the only reason I could think of.
If you are comfortable opening the speaker covers and checking inside the speakers then you can also try to check for some loose parts.
Hope this helps!

May 25, 2011 | Altec Lansing VS4121 Speaker

1 Answer

My speaker altec lansing vs4121 is just humming


Check the audio amplifiers Ic´s maybe are burned

Aug 10, 2009 | Altec Lansing VS4121 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

Speakers


First you may try speakers with another device (like a mp3 player), does it works?

Jun 22, 2008 | Altec Lansing VS4121 Speaker

1 Answer

Altec lansing vs4121


u dont need any driver to play the speakers, yes the sound card does, take down ur sound card modle no. and try looking in www.driversguide.com let me know.

Feb 12, 2008 | Altec Lansing VS4121 Speaker

1 Answer

Red light when power is "ON"


no not at all you enjoy sound ok...

Nov 20, 2007 | Altec Lansing VS4121 Speaker

1 Answer

Altec Lansing VS4121 no sound


If removing and reinstalling the driver fixed your problem then there was nothing wrong with the speakes. There was probably a problem with your soundcard drivers.

That being said, you should double check that you speakers are plugged in to the right sound board connector and the power supply is plugged into the wall outlet.

Does you computer have a headphone jack? If it does, you might try plugging a headset into it to see if you can hear sound there. If you do then you'll know the soundboard is working properly and maybe the speakers really are part of the problem. CD/DVD drives usually have a headset jack, but this will only work if a cable was run inside the computer from the CD/DVD drive to either the soundboard or motherboard.

What kind of computer do you have? Do you know if you have on board sound or a seperate sound board?

Nov 19, 2007 | Altec Lansing VS4121 Speaker

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