My current full bass rig is as follows: Zoom B3 Warwick ProFet 3.2 Head Warwick 2x10 cab Warwick 1x15 cab I play in a number of bands and play a lot of different styles of music. I find the B3 really handy for dialing up different sounds to suit the variety of styles I play. I've found the best way is to use the amp models in the B3 to shape the sound and just run them through the head with a bit of compression and the EQ set flat. Most of the time, due to transport and stage size restrictions, I only use the 2x10 cab so I'm getting approximately 200w at 8 ohms (amp would deliver 300w at 4 ohms with both cabs). There are, however, some situations where I'm just not getting enough volume on stage with this setup so I'm considering upgrading the head to a more powerful unit and while that's the most obvious solution I'm just wondering if there might be another way around it so I have a couple of other scenarios which I'm thinking might also be possible: 1: Since I'm using the amp models and eq in the B3, do I really need to run it through another preamp or could I simply buy a power amp and run the cab from that? (B3->Power amp->cab) 2. Could I just get a power amp and take a line out from my head into that (whenever I need to) or will I damage the head by running it "without a load"? (B3->Bass Head->line out to power amp->cab) Both cabs can handle up to 450w. I'm happy with the sounds I can get from my current setup but as I've said I just need a bit more "oomph" in some venues and bringing in the 1x15 for the full "tower of power" effect just isn't practical! For what it's worth I play fretted/fretless/4-strings/5-strings/roundwounds/flats/ubass/upright! (and I've got 3 kids and a wife in college so I'm on a pretty tight budget!) Any advice would be greatly appreciated!