I currently own a Peavey 15BX BW Cab and i'm about to buy a 810TVX by the same company. I've been running my combo amp into the 15'' Cab and i'm worried about what head I should buy to run the 1x15 and the 8x10. My 1x15 is 8 ohms and the 8x10 is 4 ohms. I dont know how this ohm stuff works, so what head would be able to handle both cabs???