Hello, I have a Z1 with the Z3 update. Units been amazing for the 6 years i have had it. Recently i noticed the sub output seems to be at less then half power. I switched amps, ground locations, etc. Rechecked all my connections and still no help. I pulled the deck out and while messing with the sub outputs i moved the front RCA outputs out of the way and when they touched against the deck chassis, the sub peformed like it used to. So pretty much when i grounded the two rca for the front speaker outs the sub outputs went back to normal and the sub played perfect. No backfeed, no sub pop
