Why does a head unit matter?

tips Silver Member Username: Tips Post Number: 183 Registered: Jan-05	Posted on Thursday, November 29, 2007 - 23:52 GMT If you're running all your subs and speakers off amps, why does the head unit matter?
cam Gold Member Username: •cam• Post Number: 1137 Registered: Nov-06	Posted on Friday, November 30, 2007 - 00:02 GMT Higher output voltage, than a little CD/MP3 player, some DSP, fading etc.