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Topic:
Altec Lansing ACS400 Computer Speakers...?
This thread has 8 replies. Displaying all posts.
Post 1 made on Wednesday May 1, 2024 at 03:19
SysTech_Larry
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I have an ACS400, but cannot find a manual for it.

I am confused by its two inputs, Input 1 & Input 2.
There is no switch to choose one or the other.
Are they left & right audio inputs?
SysTech Larry
[Link: knowgod.com]
Post 2 made on Wednesday May 1, 2024 at 17:30
buzz
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I assume these are passive speakers. Are the two jacks pass throughs? (Stereo phone jacks) Connect one speaker to the source and connect the two speakers together with a stereo jumper. You could prove this with a flashlight cell. Connect the jumper, “thump” one channel, then the other.
Post 3 made on Thursday May 2, 2024 at 00:49
Brad Humphrey
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There is an explanation right here:
[Link: assets.hardwarezone.com]
OP | Post 4 made on Friday May 3, 2024 at 13:49
SysTech_Larry
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On May 1, 2024 at 17:30, buzz said...
I assume these are passive speakers. Are the two jacks pass throughs? (Stereo phone jacks) Connect one speaker to the source and connect the two speakers together with a stereo jumper. You could prove this with a flashlight cell. Connect the jumper, “thump” one channel, then the other.

It is a computer speaker/amplifier system with a powered sub-woofer. All inputs come in through the right speaker.
SysTech Larry
[Link: knowgod.com]
OP | Post 5 made on Friday May 3, 2024 at 13:56
SysTech_Larry
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On May 2, 2024 at 00:49, Brad Humphrey said...
There is an explanation right here:
[Link: assets.hardwarezone.com]

Thank you. I have seen that article before. It implies that
  1. both inputs are independent stereo inputs and
  2. the "center" potentiometer just sets the volume ratio between the two.
I normally expect the center pot to adjust the ratios of L & R audio.
SysTech Larry
[Link: knowgod.com]
Post 6 made on Friday May 3, 2024 at 16:20
Brad Humphrey
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NO! That is not what the diagram is showing and telling. Look closer.

The 2 inputs are = 1) Front left & right. 2) Rear left & right.

There are 2 sets of drivers in each left & right speaker cabinet. The front firing 3" drivers for the main Left & Right channels. And a second set of 3" drivers on the side, that are for the rear Left & Right surround channels.

It is meant to be hooked to an old PC computer (ex. 2009) as the source, which had 2 sets of stereo jack outputs (Green = Front Left & Right and Black = Rear Left & Right).
Many modern motherboards still have a similar analog output these days but with an additional Orange = Center & Subwoofer output to it. Although color coding vary a lot now.

Last edited by Brad Humphrey on May 3, 2024 16:29.
OP | Post 7 made on Friday May 3, 2024 at 20:30
SysTech_Larry
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On May 3, 2024 at 16:20, Brad Humphrey said...
NO! That is not what the diagram is showing and telling. Look closer.

The 2 inputs are = 1) Front left & right. 2) Rear left & right.

There are 2 sets of drivers in each left & right speaker cabinet. The front firing 3" drivers for the main Left & Right channels. And a second set of 3" drivers on the side, that are for the rear Left & Right surround channels.

It is meant to be hooked to an old PC computer (ex. 2009) as the source, which had 2 sets of stereo jack outputs (Green = Front Left & Right and Black = Rear Left & Right).
Many modern motherboards still have a similar analog output these days but with an additional Orange = Center & Subwoofer output to it. Although color coding vary a lot now.

Thanks for the clarification. I am using it as TV speakers that does not provide surround sound.
So, a conventional front-only configuration would be input #1 only?
How should the center pot be set if there is no input #2?
SysTech Larry
[Link: knowgod.com]
Post 8 made on Saturday May 4, 2024 at 02:05
Brad Humphrey
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I can not find the original manual for those speakers anywhere online. And the diagram & wording in that link is contradictory on what exactly the center level is doing.
Either way, since you are using a TV (I'm guessing the headphone output or some line level output), it will be controlling the volume. So just set all the level controls on the speaker at about 80% and enjoy.
OP | Post 9 made on Saturday May 4, 2024 at 04:02
SysTech_Larry
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Thank you.
SysTech Larry
[Link: knowgod.com]


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