I just noticed that the Acoustic B-series cabs have dropped significantly in price recently. Does anyone know why? I've read about these cabs and nobody seems to love them, but nobody hates them either. I realize they're entry level... but an 810 for $350??? Jeez! Heck, the 410 is only $159 now. I'd think the cabs alone (sans speakers) have to be worth about that much. What gives?