Adding subwoofer to desktop ACS340

[RichK]

Hi Guys,

I would like to add a small subwoofer to my desktop PC speakers. The
speakers are pretty good on their own, but extra base would be nice.

Came by an Altec Lansing ACS340 subwoofer, which was part of a 3-speaker
set. All the controls were in the small L&R speakers. Don't really want to
reproduce the tone controls.

Been looking for a schematic for the ACS340, but nowhere to be found. Would
like to adapt it as independent sub with my present speakers. Any ideas?

Regards,

RichK

 

[Simoc]

Take a signal from them, filter out the higher frequencies, and amplify
it to suitable for the subW.

 

[RichK]

Take a signal from them, filter out the higher frequencies, and amplify
it to suitable for the subW.

Well, the line input is in the subW, from which it normally goes to the L&R
speakers. The amp is really in the subW, only the controls are normally in
the L&R speakers (well one of them).

With a schematic, I might be able to do some surgery

RichK

 

[Simoc]

Well, the line input is in the subW, from which it normally goes to the L&R
speakers.

Hmm.. you probably mean that signal is normally fed there from L&R
spkrs?

The amp is really in the subW, only the controls are normally in
the L&R speakers (well one of them).

Then, I think that u just need to feed line signal to the input I
don't think that you really need any other controls than volume in the
subw, since it plays only sub-low-range.

 

[Michael A. Terrell]

Hmm.. you probably mean that signal is normally fed there from L&R
spkrs?


Then, I think that u just need to feed line signal to the input I
don't think that you really need any other controls than volume in the
subw, since it plays only sub-low-range.

The master volume control is on the right speaker, along with the
power switch (on the back), a LED power indicator and the bass and
treble controls. The left speaker is just that, a speaker.

I have the two small ACS340 speakers, but not the subwoofer if the OP
needs them.

I have two other Altec Lansing subwoofer models, but I don't know if
the small ACS340 speakers can be used with the ACS 295 or ACS 250 sub
woofers.

 

[Michael Kennedy]

I'd guess these are similar to my ASC 45's and my ACS 45.1's with the input
on the sub and the volume control on the sattelite speakers, but yours
having an analog control instead of digital (knob instead of push
buttons)... I'm not sure how the handled that but the 45's and the 45.1's
have a simple pinout only using 5 wires. It is a type of din connector that
looks simiar to a ps-2 mouse or keyboard connector.

If your connector is a 5 pin connector I believe this should be the proper
wiring for it.
~~| |~~
2 / * _ * \ 3
1 \ * |_| * / 4
\ * / 5
~~~~~
GND
pin 1 speaker R
pin 2 speaker L
pin 3 speaker DOWN volume bottom
pin 4 speaker UP volume bottom
pin 5 LED Green


- Mike

 

[RichK]

Hi Mike,

Thanks for posting the pinouts for the 45's. The ACS340 has a 9-pin
connector. Functions include on-off, vol, base, trbl, LED.

I was able to find the schematic of the power amp chip, but not for the
whole system. Altec Lansing does not provide it.

Having a pintout for ACS340, such as you have given would allow me to
"hardwire" the bas/trbl to a fixed value add a switch for power (maybe pot
for vol)

Regards,

RichK

----- Original Message -----
From: "Michael Kennedy" <[email protected]>
Newsgroups: sci.electronics.repair
Sent: Monday, June 12, 2006 10:07 PM
Subject: Re: Adding subwoofer to desktop ACS340

 

[RichK]

I have the two small ACS340 speakers, but not the subwoofer if the OP
needs them.

E-mailed you direct, but no answer so far. You have a block on your
Earthlink address.

RichK

 

[Michael A. Terrell]

E-mailed you direct, but no answer so far. You have a block on your
Earthlink address.

RichK

I allowed it through, but I can't read it on this computer. I check
the suspect folder every day, but i have a different account set up on
this computer. I'll reply tommorow morning.