Hi, I am currently playing through a Ampeg BA -115 combo and would like to add a stack and use the combo as both my practice amp, so I don't have to lug it around, and my monitor for larger gigs. I need some advice on equipment. I have 1x15 4 ohm cab rated at 300 Watts RMS and would like to either run my XLR line out preamped from my combo ampeg to either a Head or poweramp. Keep in mind a tight budget. Questions: 1. Can I go XLR combo out to XLR in on a power amp without a problem? 2. If #1 is not possible would a preamp / power amp be the best option or would a head be better? 3. I would like to eventually add a 4x10 4 ohm cabinet in addition to the 1x15 so I would prefer a stereo poweramp. Comments and suggestions would be most welcome.