i have a Power Acoustik PMW 19 Preamp EQ. it has knobs to turn for low, mid, high, bass, subvolume, sub frequency, and a master volume knob i have set to max. how to set the low(midbass) frequency, mid(mid range) frequency and the high. i have connected the sub controls to the sub volume input. so the bass knob does nothing. so how to set how much my sub or bass and the sub frequency. Turn the knobs all the way up or can someone help me set to suit the sound to be a good balance of bass, mids, midbass and highs? help plz........thanx