Alrite, so today i took my car in cuz one of my rear speakers were distorted n since its under warranty still it'll be replaced but i asked him if he had anything louder...and he said my current speakers would be alot louder if i had a better HU...he said something about my rca outputs not being powerful enuff???...is this true?....this is my current setup for HU and speakers....
Isn't going to make a difference if the amplifier isn't powerful enough, that's what the gain is for. If you want it louder, then get either more efficient speakers or a more powerful amp, or both.
I meant to say head unit, not amplifier. Just noticed that. I can't think of a head unit out there that is so weak that it couldn't be compensated for with proper gain setting. Like Isaac said, it isn't a volume control, it is for level matching.