So I finally was able to get all the components together for my rig (all thanks to members of TB!): SWR IOD QSC RMX 1850HD Acme Low B4 (8ohms) I absolutely LOVE the sound of the Acme, but I was finding it too quiet with my Little Mark II. So, I switched to the pre/power amp setup to get a nice whallop of power. However, when I set this up for the first time to run at rehearsal, I found myself running the QSC in bridged mono mode (1100 watts) at full volume and I was only barely loud enough to keep up with a drummer and guitarist (who uses a 20 watt tube amp). The preamp was cranked up to the point of almost clipping the input of the QSC. I tried turning on and off the filters and clip limiters on the QSC and even running it in stereo mode off one channel, but I still found myself maxing everything out. My band isn't THAT loud. I used to have the Little Mark II running at 300 watts into an Avatar 1X12 speaker and it was about as loud as I'm getting now. Is something wrong? I know Acmes are notoriously innefficient, but could my Low B4 be so innefficient that 1100 watts is not loud enough for a 3 piece? Maybe the QSC isn't bridging properly? I didn't notice a discernable volume difference between running the amp in stereo or in bridged mono, so I'm wondering if it might not be putting out the full power I need. Oh, one other thing, the speakers in the Acme were barely moving at the volume I was playing. If I understand correctly, these speakers are meant to be able to really pump and move a LOT. Could I still be underpowering this cab with 1100watts? I appeal to all Acme users to help me. I absolutely LOVE the sound of the cab, but I need to hear it at useable volume levels. Is this impossible? QSC (or other power amp) users, do you notice a large volume increase when running your amp in bridged mono? Could my lack of volume difference mean a problem with the amp (it was banged up a bit in shipping...) Anyway, any light that could be shed on this issue would be MOST appreciated! I have a big show on Thursday and I'm pretty bummed that I can't have a crushing wall of bass.