long story short, i have the monsoon "9" speaker system in my '04 grand prix. i tried hooking up my alpine cda-9815 to the PAC os-2 interface, using rca connectors. now it has really loud amplifier turn-on thumps when i switch tracks, mute the volume, etc. it worked fine better when i was using the speaker outputs of the headunit, but the center speaker on the dash has always made a static noise when the adapter was used. reason i want to be able to use rca inputs is so i can use a dsp unit instead of a cd head unit, for space reasons. any good ideas? i'm pretty tempted just to gut the stupid thing and go all aftermarket

. btw, all the functions for lighting, etc. are run through the trip computer, so i'd just need a chime/onstar interface if i wanted them badly enough.