Re: Sound problem as results of high volume...not sure where to start
Hrmm tricky. I won't be of any specific help,.. but I'm interested in how this turns out.
To me the most likely culprit is the head unit (perhaps needs repair/replacement -- but don't do it based on me saying that) -- It still could be your amp technically even if wiring looks fine.
And there is , to me, a less than 1 percent chance it's speaker related. Weird things happen,.. but I'd guess Headunit, if it's fine.. Amp..
This is what I would do.
I'd grab some speakers (any proper ohm speakers ) and go wire them up to the Amp and just see if the same issue happens. Probably will,.. if not.. It's the speakers (crossovers, wiring, speaker itself, etc.. Not likely though).
If you HAPPEN to have another amp (even of lower power)... I'd wire the speakers and power, and so on into it just for a test.. If the "new" amp works.. you've found your culprit (unless for some odd reason the wiring just needed adjusting on the amp (ALL the wires, not just speaker wire)..
I know I don't have extra amps laying around.. but if you have one.. it's a good way to isolate it.
If you have neither speakers nor an amp to test.. (this may be the best thing to do first anyway).
I'd pull the headunit out and basically unhook everything and go over the wiring .. harness, pre-outs, remote, everything really well.. (check crimps, solders, joints, etc.) Then put it back in -- (As with the other things.. if you have or can borrow another headunit of any kind .. I would use it to test the rest of the equipment (amp/speakers).
Someone may come in here and say that's (XYZ) and you will be fixed up. But, to me it sounds like a trial and error troubleshooting issue.. but shouldn't take long to isolate which component (or wiring) it is.
Good luck.. I'll be watching the replies to see what it is/was.
Vehicle: 2008 350Z
Headunit: Kenwood DDX-470 - Front Stage: JBL 6.5" MS62C Components - Rear: (1998 German) MB Quart 6.5" QM-160-KX - Sub: SRQ Custom Enclosure with JL Audio 10" W0v3-4 @ 300w RMS - Amp: 5-Channel PPI 900.5 - Wiring: KnuKonceptz 4g Power/Ground + 3 Sets Twisted Pair RCA's - 14g Speaker wire - NVX + Rattletrap Extreme Sound Dampner (30Sq ft.) Throughout - Extras: Rear/Reverse Camera - KCA-iP-202 w/ Garmin Navigation Integrated with Touchscreen.