Let me try to get working on this again then. I have to tear apart my Rio to find the problem with the grounding. I believe I did get the gain up to achieve 4 volts P-P, but an oddity with the ground remains.

Given the size of the sub board, I don't think it will be a problem to stash it somewhere in a 2 HD unit.

Stu
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If you want it to break, buy Sony!