A guy's trying to sell me one of these and according to the Ampeg site, it is indeed a 4-Ohm cab... But I've been sitting here trying to figure out how you can get four Ohms out of SIX typical 8-Ohm or 16-Ohm drivers. Anybody know what's in these things? Are they non-standard impedance drivers (which I would want to avoid), or what? Am I just missing some non-obvious arithmetical solution in my head? Site.