Mr. Land wrote:
I have a Labtec powered speaker system model LCS-2412. This is a 2.1
system intended for computer use. It is quite old, purchased circa
1991.
Around '96 or so, I noticed that the treble control was only working on
one channel. The unit was out of warranty by then, but since these
speakers have just the right features for me, I decided to try to fix
them myself rather than try to find a replacement for them.

Reverse engineering should be quite easy for such equipment.

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Met vriendelijke groet,

Maarten Bakker.