I just received my Polk Bass Module for my polk C300.2 amp. After I hook it up what should the settings be set to on my amp. I am using both channels to power 2 12" Infiniti 1230w subs individually. Should the gain on the amp be set to "0?" Anyone else have one of these installed. No sub control on my amp. RCA's are hooked up to my HU's rear output. Thanks for any help!