sounds like something is getting pinched, shorting, or pulled when the seat is lifted. Get in the trunk and have someone lift the sea. Look closely to see what's happening, I'll bet that either as above, the rca's are moving, or the speaker wires are touching something (amp case, metal, each other). Good luck!!

__________________
2004 300M SPECIAL
Alpine CDA 9833
Alpine Pxa-h701
Alpine Rux-c701
Rockford fosgate p400-4
Rockford fosgate p4004
Hifonics BX 1205D
JBL c608 GTi
JBL p963
Infinity 2.5" center channel
Alpine type R 12"(2)
200 amp alternator
yellow top battery
0 awg power and ground (welding cable) 300 amp anl fuse
all active SQL set up with 2000 watts rms