It's an expensive investment, but I bought a Bose L-1 with the T1 Tonematch mixer. This thing cuts through any volume level and makes BIAB sound fantastic; pluse its easy to haul around. It has a usb in/out so I can use my computer with great sound reproduction (sometimes I just use mp3's I've transfered to my iphone. There's hardly any feedback problems so you can put it right next you. Oh, and that acoustic bass realtrack is out of this world!

Mike