I was wondering if anyone remembers the old Ampeg amps that you unlatch the top and pull out the amp head? They have 15" Jenson speakers in them…I have one (less the head) and need to know what the impedance is on it. I only have two heads, but three cabs, wondering if I can put the Ampeg with my bass 410 for a clean amp and use distortion with the 412. Thanks again…RJ.