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Altec Lansing ADA 745 (made for Dell) Right Front speaker which controls volume has pins in the connector to woofer are bent broken. Worked fine until damage. No sound. Can connector be repaired or does this one failure take out use of 4 speakers and woofer?

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It is easy to replace from near service center near you.

Posted on Jun 27, 2008

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Need help with altec lansing ada 745 4.1 speakers


Does the right front speaker need to work in order for the whole speaker system to work?

The whole system can still work with or without it.

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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 :)

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Dell Altec Lansing ADA 745 speakers. The computer connectors are different than on my old Dell 4550. However when I connect to my new Inspiron 580 using the cable that is connected to the subwoofer, I...


Found your problem when trying to solve the same issue.
I have just got a Dell XPS tower and am having the same issue.Given that your post was 5 months ago, did you ever solve it ?
Charlie

Jan 26, 2011 | Dell ADA745 Computer Speakers

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VS2521


I found that one of the pins of the plug connecting the sub-woofer was bent and the plug was not seating properly deep in to the slot. Every pin has a specific task to the sound system, it seems. I set right the bent pin with a long needle gently and re- plugged in to the woofer's slot. After that every thing works amazingly. All it requires is patience and application of mind for a while exclusively focused on the problem.
Thanks and regards
M. Narayanan

Jan 15, 2010 | Altec Lansing Audio Players & Recorders

1 Answer

Short in subwoofer wire - Altec Lansing computer speakers & sub


yes, you can splice the cables and put on a new connector, goto radio shack with the old connector and im sure they will have one you can splice right onto it. ive done this many times with varios equipment "headphones speakers etc" it may take a couple of tries to get the wiring right but if its just one speaker there will most likely be just 2 wires, if you wire it up and it doesnt quite sound right, wire it the other way. speakers will work wired backwards but wont sound quit right so if it doesnt, rewire it and it should. good luck and i hope this helps!

Jan 15, 2010 | Altec Lansing ADA 885 Computer Speakers

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My Altec lansing multi media ada 745 just stopped working all of a sudden. It doesn't work for all media ie. ipod, tv, computer. We can hardly hear it. I changed the fuse but it still doesn't work. Wh


unplug the power from the speakers, reseat the all the connections for the satellite speakers, ensure the power switch on both the subwoofer and the Right Front Speaker are in the ON position.

If that doesn't resolve the issue, then you are most likely going to need to replace the speakers, as the fuse is the only serviceable componet.

May 20, 2009 | Dell Computers & Internet

2 Answers

Altec Lansing ada745


Oh, my goodness.  I have the exact same problem, and it just happened to me today as well, same model.  The fifth prong got bent in while I was trying to plug it back in after diagnosing a different issue (speaker volume would randomly jump up and down regardless of audio source).
It looks like a PS/2 style connector with one of the top pins missing, so I thought about taking an old PS/2 plug and grafting it on after breaking off one of those pins, but the center plastic block on the PS/2 connector is unfortunately keyed differently than the speaker plug (it's lower down on the PS/2 plug).

Aug 15, 2008 | Altec Lansing Multimedia Computer Speakers

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Need wiring and 9pin connector diagram


Dell (Altec Lansing) A425 Subwoofer Pinouts

This is a standard female DB-9 serial port.
Here are the pinouts.

Pin 1 = Left Speaker Out +

Pin 2 = Left Speaker Out - (Common Ground)

Pin 3 = Left Line In +

Pin 4 = Right Line In +

Pin 5 = Left/Right line In - (Common Ground)

Pin 6 = Right Speaker Out +

Pin 7 = Right Speaker Out - (Common Ground)

Pin 8 = Power A

Pin 9 = Power B

Jumper (short) Power A to B to turn on.
If you want a volume control you need to put one on the inputs. You will buy buy a stereo volume control or potentiometer.
Here is some info on how to do this.
http://g4tv.com/screensavers/features/43665/Pump-Up-The-Volume.html

Cheers!

Mar 27, 2008 | Altec Lansing ADA425 3-piece 30-watt...

1 Answer

Altec lansing ada 745


need to check your control center,then if thats not the one"it should be set @ 3/4 volume....
if no diff,,,,,then you need to go over checking every program that shares it,,,has their own volume control,,,somewhere there is the problem,,,maybe real player,,,media player,,,flash player etc...
thnks ttyl
Polywoggy1@hotmail.com..

Mar 10, 2008 | Altec Lansing Multimedia Computer Speakers

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