I've tried the gains all over the board. Its hooked to a pioneer avh p1400. I just used 2 sets of cables. Front and rear. I'm sorry but I'm not all together with electronics. When I got it new years ago it rocked 2 mtx 12s now in this vehicle its not powering the 1 Kenwood 12 like it should. I ll check gains again but is their anything else to check? The power light is on and the fuse is good but that's about all I know.