installed new pioneer head unit w/ alpine speakers... need help Options

[DIONYZUZ]

So I just installed the pioneer head unit that supports 50w per speaker and I got 4 alpine type r speakers that support a peak 600w per pair (1200w total) . And I hooked the unit up connected to the factory amp, which I'm thinking was not such a good idea. When I installed they two front speakers they sounded decent, but it seems like the rear speakers are barely letting sound out. At first I was thinking it was the speakers, but now I think the amp to the unit is distorting the signal for the speakers. Would it be better for me to replace the factory amp with a pioneer amp to get these alpines with better power and clarity or is the factory amp not a problem?

[pnoywitmustrdsau...]

bypass the factory amplifier located underneath ac climate controls. unbolt the amplifier with a 10 mm and then unplug the 2 harnesses in the read of amplifier. if you purchased a wiring harness (17-1761) it should plug directly into the harnesses you unplugged from the amplifier. but consider the fact that any aftermarket radio has typically 18-22 rms watts and the type r speakers u purchased requires about 110 watts rms max. consider buying an 4ch amp.