My Peavey Mark IV head is giving up the ghost. I ordered the Behringer Ultrabass BXD 3000H. My cabs are an old Peavey 1810 and a Peavey Headliner 410. I'm not sure how to wire these cabs so I get the full 300 watts from the head. The Ultrabass has 1 output which will give 300w/4ohm, or 180/8ohms. There's another 1/4" output that says Class 2 wiring. Whatever the hell THAT is. The 1810 says max power is 200 watts. Impedance is 4 ohms. Crossover is 500Hz. There are two 1/4' inputs that say Normal and Full Range. Then there are two more 1/4" inputs that say bi-amp, one labeled Hi and one labeled Low. No idea *** those are for. The 410 has a max power of 800w. But the impedance on this one is 8 ohms. Then there's this weird input that looks like one of those XLR/1/4" combos. It says Full Range Inputs in Parallel with 1/4" jacks. Pin1+, Pin 1-. Then on the bottom, there are two 1/4" inputs that are labeled Full Range Parallel Inputs. I'm clearly no bass techie. I just play! So can someone please explain any of this to me and what i can do to get the best and loudest sound possible? I thank you.