Ah, so I see.....I would have two boxes per side, each containing a 4 ohm 12" driver, the two powered by the upcoming dual-channel Rythmik amp. For stereo, I would need one of these set-ups on each side. Or to get two 12"ers per side right now, I could just get four F12's, and stack them two high on each side. I was under the impression that I could presently get two cabinets, each containing a pair of 8 ohm 12" GR drivers powered by a 370W Rythmik amp, a dual F12 in otherwords. I didn't know that the Rythmik amp's servo-system would not work with two drivers. Never mind! And thanks for setting me straight.