Howdy, I just picked up a GK 800RB. The manual is extremely vague! I have a Ampeg SVT 210 HE Cab. and a Traynor TC115 Cab. Both cabs have two 1/4" jacks and two speakon jacks. The GK head has a 1/4" speaker.hi out, 100w, 8ohm min. and two 1/4" speaker.lo out, 300w, 4ohm total, 8 ohm min. I cannot figure out how to make the connections. I am playing reggae and have the attenuator on my ampeg off. Can you please offer soma advice?