So last night was my first real chance to gig with the IPR3000, Kern and both cabs... I didn't bridge, I ran one cab off of each channel, roughly 450w @ 8ohms per cab. What can I tell you? Well, I only had the Peavey's attenuators at 9 o'clock and I had my bass volume set at half way up...
The room is small, with room for about 150 standing comfortably and 200 when packed in. Not that many last night, unfortunately due to severe storming. But anyway, We ran vocals, kick/snare keys and one of the guitars through the flown 15's with horns. There was a sub for kick and lows but I don't go through the house in this room.
The two cabs, each being fed a scant 450w was brutally heavy and loud. Out in the room I was shaking walls, vibrating things off of tables. I goofed about during check and turned up from my bass just a little bit extra and I can say that you can get into 'brown note' (I joke) territory. Super heavy but clean and very clear.
I shared backline with the other band on the bill...who were from 5 hours out, so they didn't want to carry all their gear. It gave me a chance to hear the rig from the room, and you'd think it WAS in a very nice PA front end. Very clear, clean and smooth down VERY low. None of the wash, breakup, etc. that you'd expect from carrying a room from the rig. I love sharing backline with this setup because it's such a joy to hear out front. The other band (a great bunch of guys from Burlington Vt), love it as well.
I can't imagine really needing more power than this, although I also haven't hit a point of breakup with these cabs with this amp setup. None of the mid-speaker breakup I was getting with the LMII was present no matter how I dug in. AND I can say that I played cleaner and with more finesse than usual due to the amount of clean headroom and the 'hearability' of the setup.