Ya, i'm trying to figure the best way to supply the BB3 with enough wattage when combined with my other 4ohm cabinet. I have a Tecamp Black Jag 900 head, and it has separate power amps, each with their own outputs (Channel A, Channel B), each rated for min 2ohm. Each of those outputs can put out 450W at 4ohm, but at 8ohm (BB3) it's only going to receive maybe 175W through the separate channel. Now, the head does have a bridge mode, which will do 900W, but min load for bridge mode is 4ohm, and if I combine the 8ohm BB3 with my other 4ohm cabinet, the resulting load will be about 2.8ohms… which is obviously below the 4ohm min for the bridge output.