OK, I hope I phase this in such way, that it makes sense to everyone.... BUT.. On my BA115SP, it has what is referred to as a Balanced Line Output... the documentation indicates its for hooking into a house sound board, or an external amp of some sort. I've noticed that QSC Power Amps, have what is referred to as an XLR Input... They also have what is referred to as TRS inputs, which look like your standard 1/4" jack. The BLO & XLR jacks sockets LOOK identical. By all practical purposes, I should be able to use my BA115SP as a preamp, in the short term,,, until I buy a "real" pre amp... Sure, its not optimal, and I can think of any number of preamps that would be better, but I dont really want to buy a pre,, until I know which pre I actually want. Any input would be appreciated.