So i went ahead and set my gain by ear like i always do. My issue is with this amp that i just got is that when i set it correctly the bass is WAYY to low. Its powering a 12" alpine type X dual 4 Ohm sub. My voltage stays constant at around 13.5 to 14.5V. My pre-outs on my deck are 2.5volt. But i have to have the amp at 0.3 volts 0.1 being max. No clipping issues or sound issues that i can hear...it sounds killer but its bugging me that i have to have her at 0.3V to get the right amount of sound out of her. EQ is FLAT all bass boost is off and my lpf is around 75hz. Help guys? any tips would be greatly appreciated i am NEW to this but its not my first system. Ground wires all grounded to frame all 4GA cable...ground cable is about a foot long. Could my rdy rod terminals through box be holding some current back???