Long story short hooked up my new system today. Arc Motos and DD D4 amp. Running it bridged. Tuned amp system sounded really good. turned off bike put some tools away. turned bike bak on just to acc and the system sounded like it had blown speaks. can hear what sounds like cross talk or a really bad fm station. checked all my connections look fine. Did rest on the HD Radio a 2016 SGS. Sounded a bit better but still like crap. Started playing with the connections and unplugged one input on the BT355 coming from the radio and the sound really cleared up. Tried just using just one input switching inputs and one does sound worse then the other. Plug them both in and sounds like crap....Stressing out big time here.

 

Try a different set of RCA's just to rule those out.

 

Tried new RCAs no differences. It looks like the issue is with running it bridged. I decided to just run it off channel 1 and 2 and it sounds just fine loud and clear nice base. So I am waiting to hear back from Alex and see what he suggests.