HI, I have the same problem with a MINX subwoofer, can any one help.
I upgraded my spent capacitors for higher power IE: 30 to 50, also found a crack in the 16 pin amp chip. works like new. the capacitors are slightly under powered for most 100 amp systems and they fry like batteries left in a flashlight. The parts can be ordered online and they are noticeably bad upon visual inspection. if electronics is not you forte seek an electronics nut and they will be able to download specifications and schematics to replace parts. The capacitors seem to be the most common meltdown and only cost a few dollars online. just get the description on the existing capacitors and then upgrade the power rating for higher peak performance.
Register and download the manual for free at retrevo.com
http://www.retrevo.com/support/Onkyo-TX-SR608-Receivers-manual/id/23653ag916/t/2/
At the Onkyo, check to make sure you have run the speaker setup starting on Page 40. If that doesn't work...
Disconnect the subwoofer pre-out at the Onkyo and move it to the VCR Out, tune an FM station and be ready for some real loud subwoofer output if your sub has no volume control of its own. If you can hear the sub, it works and it's back to the Onkyo. If not, the unnamed sub
Register and download the ONKYO manual for free at retrevo.com
http://www.retrevo.com/support/Onkyo-TX-SR608-Receivers-manual/id/23653ag916/t/2/
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