I have a Pioneer DEH-P500UB and Hifonics TXI-6406 4 channel amp.

I have the front RCA outputs running to the amp front inputs pushing my door front door speakers

Then from the sub output rcas on the head unit to the rear inputs on the amp pushing an Alpine type r 10 DVC.

The rear speakers are running off the rear outputs on the head unit.

My problem is that I cant fade the speakers. If I try to fade to the front to attenuate the back speakers out it kills all the speakers?

Are the RCA's non fadeable?