Ahhhhh... DJ-ing... disk jockey...yeah. OK. got it.
Ummm... why not just plug into the wall?
You won't get enough power to run two amps, two subs, and two mid/high cabs from a car battery.
You usually crossover under 90hz for the subs, then depending on the speaker configuration and effeciency crossover again around 4khz from the mids to the highs. The Wharfdales have a built-in crossover (called a passive crossover) so you don't have to worry about that.
So, the signal path goes like this:
Mixer output (L/R) ----------> crossover Input (L/R),
crossover low output (Mono)-----------> amp input -output to sub
crossover mid/highs (L/R) --------> amp L/R input - output to Wharfedales.
Honestly tho, that would be OK for a small room/garage, but woefully inadequate for a club.