I have an alpine 9851 head unit, two 12" MTX thunder 6000subs powered by a JL e1200 amp. Im wanting to change the amp to a Directed600d amp but I dont know what to set the dials for Gain, Frequency(20-50),LPF(30-250), and the switches for Slave/Master(0-180), Subsonic(On/Off),Bass EQ(On/Off) , and Phase(0-180). Im lost so any input, advice or recommendations would be greatly appreciated. Thanks.