I got confused. I thought when he said "PC > Amp" he meant "PC is greater than Amp". I was assuming that we where talking footprint here.
Sorry could not resist.
Anyway. Yes, you will have no problem hooking your PC to your amps directly if all your speakers are powered your amps. Some factory installs power the front speakers off the dash unit, and a seperate amp for the back. You might also want to check the voltage expectation on the audio inputs of your amps. Some amps are hooked on to an amplified signal. In this case you migh need a pre-amp.