Quote:
Originally Posted by ghoney81
I hooked up the door speakers to the amp. They sounded pretty good IMO and held up for couple of months until I swapped them out.
I had problem w/ one of the PPI speaker and had to get it replaced. so I can't comment you on their level of quality control but they sound great once you set them up correctly. There is no competition btw them.
stock 3/10
stock w/ amp 5/10
PPI 9/10 
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The bottleneck on our car is the headunit. You really need a good dsp, strong pre amp signal and decent power to bring full potential of PPI. Otherwise you wont see much of difference.