Hi, I'm going to install some components with an amplifier. I have been told that the bass levels from components in the front alone sometimes is not desirable and that rear fill can be used to fix this. Just wondering how true this is or if I can expect good mid bass from components alone?

The amps I'm considering are the Soundstream TX2.350, STL2.350, Picasso PX2.420 or the Harman/Kardon CA280

Speakers I'm considering are JBL GTO 609C, JBL GTO 608C (older?) or the Infinity REF-6500CX

Any suggestions on a good choice out of these amps or speakers or even something completely different within there price range?

Thanks.