Hi guys, got a bit of a problem, my Alpine Sub unit/box cuts out the bass when i crank the volume up very loud...(i.e 24 out of poss 35)its running off a 500watt mosfet 4 channel amp, with + wire running off channel 1+ node and -wire running off channel 2- node, this being the way the unit was wired in previous car.any advice welcome please?i thought the sub wouild use 1 channel, you know a channel for each component??