I've got a Kenwood KDC-BT755HD fully loaded with Sirius XM, Bluetooth, HD Radio, Pandora and everything. Using its 6 pre amp outputs to push a Hifonics Brutus BRX320.4 4 channel amp going to JBL GTO628 speakers (low cost, but good for the money) and a Hifonics BRX1100.1D Pushing two Rockford...