For Altec lansing model A425 satelite speakers and sub woofer 9 pin connector wiring diagram.
My plug from the satellite speakers to the subwoofer is broken, need pin
order for the 9 pin plug.
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Normally these low end system components depend on each other and cannot be interchanged with components from other system. So if one of the components (subwoofer or right control satellite speaker) breaks or gets lost the whole system is unusable... I was in the same situation. Got a subwoofer 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. Speakers are also glued together so it is impossible to open without damaging it. Obviously there is no service documentation anywhere.. But if you like electronics you can try to make something based on the information below:
Altec Lansing VS4121 connector pinout: Take the male connector (from right satellite speaker) and number pins in first row from left to right as 1-3, pins in the second row as 4-7, pins in the bottom row as 8-9 and the circle enclosure as 0. Then: 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 - Headset Left 6 - Ground for Headset (grounds 0 and 6 seems to be connected in the subwofer but within the right satellite speaker they seem to be isolated with separate leads to sub) 7 - Power ON/OFF. When OFF or headset jack plugged then 0V. When ON and headset jack unplugged then 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 subwoofer you will need to implement: - Power On/Off (switch between pins 8,7) - Volume control 50k potentiometer (probably anything between 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 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 short any 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 VS4121 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 :)
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
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!
I have the same speaker set. maybe we can help each other. My plugs are all fine but my sub is not connected to anything at all and I need to know were they must go on the pc board. Maybe we can trade some photos on the wiring diagram?
there are fast checkings for you:
Quick Connect Card
is the system working fine exept the sub?
my guess: the headphone jack works fine then the speakears are too
if soo then the sub amp is bad
or some connection is torn
try opening the sub and see if everything is hooked right
and if soo then the amp is the problem
every electronics shop can fix this