This is what I have check
ground wire good check it in 2 spots no ground noise
Ran all wires separate from each other
Power wire ran all by itself
Swap LC2i converters
Even took both rears speakers for input to converter.
made an extra ground on converter to chassis
Upgraded ground wire...
I installed my system alpine sub jl amp LC2i converter. Everything ran great but I get this increase in bass through the subwoofer only at 1500-2000 RPM I do not have the B&O just the nine speaker system need help thx