OK so I'm new here an I'm upgrading my amplifier in my car an I've ran into a few questions I'm replacing a Sony XM XMZR1252 800 watt amp with a Orion cb3500.1d I my first question is the amp didn't have a bass knob when I bought it an I checked the only audio shop around me an all they would tell me is call orion an I've tried to an can't reach anyone it's a 3.5 mm audio jack looking input an I was wondering what kind of gain control bass knob would work with it I was told only certain ones would others may harm the amp. Secondly what size wiring harness should I get for this amp the Sony was a 4 Awg an I know that's to small for my orion ishould run 0 awg with this new amp correct? Any help would be appreciated thanks!!!