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Tnguyen wrote:
I have a Samson S1000 that accepts a subwoofer signal from pre/pro and
drives a passive SVS subwoofer. Until recent day, the amp stops amplified
sound. Through troubleshooting, it indicates that the fault is in the S1000
amp.

Suggest you post in:

rec.audio.tech

Also search Google for technical discussion groups.

Also read your Samson manual and ask Samson for advice.

(snip)