Well, I finally found the time (after lots of real work, then a Disney World vacation) today to check into things. I traced the hiss to the aftermarket connector used to connect the aftermarket head unit to the sub wiring harness. I moved the left rear + wire a little and the hissing stopped. Moved it back, the hissing started again. So I taped the wires in a position where they all work, and put everything back. It sounds good now, so I'll monitor it for a while and see what happens.
Thanks all for your help! PTE is the best!
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Jeff - '01 Inferno Red 27G, w/ABS, 3-ball shift knob (homemade), passenger armrest, Passport 7500, lowered, painted bumpers, various chrome bits, Alpine w/iPod control, Boston, OEM sub, MA reg. PTEEEE
