How do you klh sub woofer psw8 - KLH PSW8100-8 Subwoofer

SOURCE: sub woofer produces a very loud low tone

This model has a high failure rate with the power supply board. Typically, power resistors fail, which in turn burns out the big capacitors.

I have not heard of transformers failing though, so it shouldn't be too much to repair it.

Here are the schematics for the unit: Upper board and Lower board

SOURCE: KLH ASW8-100b Sub woofer. I

Some specific model numbers might lead us to specific manuals and specific instructions.

Depends on your source and its amplifer complement. Some can drive a subwoofer directly while others just produce a Line Level subwoofer output for use by a separate amp feeding a subwoofer or self-amplified sub.

The set-up of the source to produce a subwoofer output is totally dependent on its design. Generally, you have to 1) tell it you have a sub, 2) define how bass will be routed or shared among your various speakers accordingto their bass-handling capacities, 3) using test tones, set the relative ludness and crossover settings so you have a uniform sound field.

To find a manual, maybe run it by the manufacturer