I've been leaning towards a lighter, smaller alternative to an amp head and speaker cab. The two brands that I'm looking at, the Traynor SB and the Fender Rumble. Both work well with piezo pups from an upright bass and both have a XLR outs. So I have two questions that I think you guys can answer. 1. Can I use the XLR to my bands PA? The PA is two powered speakers and a mixer. Then our mics. There are XLR inputs on the mixer that can be used or 1/4 inch. I'm not sure if there are enough XLR inputs. I might need a converter...i don't know. 2. I think most things being equal, size weight and volume, would you recommend a Traynor SB10 or a Rumble 40? Traynor SB12 or Rumble 100? The PA can help with volume...Yes?