I did a search; didn't see this addressed. As I understand it, a tube amp's output is the same regardless of the cab's impedance(say 4 ohm vs 8 ohm). Firstly, correct me if I'm wrong. If this is accurate however, is there an advantage to 4 ohm over 8 ohm? To be more specific, I'm trying to figure out the ideal cab/cabs for my D-180; if I do a pair, of course I'll want two 8 ohm cabs so using them both will keep it at 4 ohms. If I decide upon a single cab, won't the power output of the amp be the same for an 8 or 4 ohm cab?