I just got an alpine CDA-7876 from my brother for about $100. At the moment I use my stock head unit to power my subwoofers(2 treo12SSI). My amp's gain is about 1/2, and it gets warm pretty quick. It is an US200 by USAmps. Now my question is that in the thread title...will an aftermarket head unit give more output to my amp than just the signal I currently get from my rear speaker? Thanks Guys!
it'll be a much cleaner signal.. I don't know if you'll get any 'more' bass. chances are it will improve a bit though. a 4V pre-out won't make the system louder, but it will improve resolution and detail and help lower the noise floor of the system by providing a cleaner signal.