The biggest difference between a deck powered system, and an amplified system is the 'fullness' of the sound. For instance, you do a full sweep with a subwoofer installed in the system and you will notice a huge cutoff in the mid-bass output. Install an amplifier and you'll get a smooth bass transition during a sweep, and you won't be able to tell where your sub cuts out and your doors come in.
We need to butt heads man, I'm off tommorow, what are you up to?
I'll let you check out my system. I'm amped for the doors, but still running the JBL amp for now. I have a JL 300/4 to install whenever I can get ahold of some MDF speaker rings. I need to get rid of the stupid plastics. Once thats complete, then my system will be 90% JL Audio. The only exception being the subwoofer, which is a rockford shallow mount
I don't care what people say, I have been addicted to JL audio since day one. They are extremely underrated and people who say they're junk don't know how to set a stereo up properly and blow their equipment within weeks. You'll see when I get my system finished
Edit, I'm not cracking on Phoenix Gold either, I would probably buy them over JL, but JL is far from junk