The gain knob is not for twisting it all the way to the right to get the most out of your amp. It is for matching the output voltage of your headunit (and/or anything else before the amp). Turning it all the way up will not make your system any louder than if you had it set properly. It will increase the chance of you hurting/smoking something with the volume cranked.i know i dont want to wait though.....this sub could handle full gains from the opti 1400 D @ 2 ohms right???
....should be around 800 watts.