AVS Special Member
Join Date: Aug 2001
Location: Princeton, TX - USA
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If your sub consistently works with the ipod, then the amp is fine. are you running a y cable from the receiver as well? maybe one of your input jacks is screwy, so try both. does the amp indicate that it is sensing a signal from the receiver when you run test tone...does it come out of standby (led turns green)?
I once had an onkyo 602 that lost its sub output. took it to repair shop and they said it was fine. i made them hook it up to prove it to me...the guy hooks it up to a tv's audio inputs, cranks the volume and i can barely hear the test tone. but i took it home regardless, and it worked again in my system. i had done all the proper troubleshooting, so i know the sub output had quit working. configure it properly, then give your volume knob a quick triwl to see if it comes back.
some subs will really crank when you don't insert the rca jack completely (they pick up lots of 60Hz noise before the shield/ground makes contact). You can try forcing the sub amp on (set your gain to about 1/4), then plug the rca cable in slowly to see if you get sound. just a tip you can try to test the amp.