Its a 6channel amp. I have the speakers running off channels 3+4. I dont have my sub connected yet which will be going 2ohm bridging 5+6.

Im unsure what Im doing with channels 1+2 right now... but anyways....

The amp has an independant HIGH and LOW crossover for channels 3+4 (and a gain control).
Off the top of my head... down to 45hz - not sure what the top is.

There is also an option to run 3+4 stereo or mono. I have it running stereo currently, however when I press it to run mono its SUPER quite. Perhaps this is because you need to bridge the channels?

THanks