hi, i found in my dad`s house a peavey guitar head, MACE; 160 w, all tube, 6 6L6 tube. i wonder if i can use that guitar head with a bass cab. in the rear of the peavey has 2 speaker out, main; 8 ohms, aux; 4 ohms, i wonder if it can be use with the 4 ohms of the most bass cabs????? what do you think??? how can i use this guitar head for my bass ????