I have just installed a PBR300v4 amp, RF-HLC4 converter and 4 P-152 speakers in my 2010 Harley Ultra Classic. I have the remote control wired up. Where does variable high level adjustment and crossover switch need to be ?

 

Crossover should probably be in AP (all pass).

Are you running RCA's from an aftermarket head unit or the high level inputs from the stock radio?