speakers problem

So i got new alpine head unit to replace the old pioneer in my celica, but now i cant go over the volume of 3 because then it starts to distort and sound like shat, what do you make of this?

i drive a 2000 nissan maxima with B.o.s.e (buy other stereo equipment)factory system installed. about six months ago i replaced my bose head unit with a clarion cz500. everything worked fine up until i decided to install a different head unit( pioneer 980-bt ) i remove the harness to wire it...

Hey guys and gals, HU:Pioneer 880PRS, Comps:JL TR525-CXi, Amp JBL GTO4000 I believe (older amp for sure) When I first power up everything is good but after a bit my FR speaker fades in and out (not completely), and it happens randomly I haven't found any consistency to replicate the problem...

Hello, i got soundstream rbt 653 3ohm speakers 100rms watts, and i got gothic 1200w amp 4ohm and do i connect the speakers straight to the amp? or do i connect them to the stereos to? i already connected my subwoofer and the amp,