Quote Originally Posted by alexproftw View Post
Hello there! I have bought a JVC KD-R 561 HU and I replaced back speakers with Pioneer TS-G1731i 6.5' speakers.
I cannot get any bass and it sounds good only if I stay with my head sticked to the windshield :/. Are there any HU configurations that can make them sound good? On the front doors I have the original Chevrolet 4' speakers. I plan to change those too.
Thank you for your help
They aren't technically 4" speakers. They are 4.5" speakers. They are a bastard size that has very few decent options. That said, your 6.5's in the back should have decent bass. I'd check and see if you have a highpass filter set on them and at what frequency, because if you do, too high of a highpass will filter out most of the bass that the 6.5 is capable of.