purpletornado

Thanks for the reply.  I plan to use the system as a PA for band practice, so it will not need to be in stereo.  I realized after my original post that when two speakers are connected in parallel to the same channel, that the watts are halved, thus each speaker will only receive approximately 263 W, well below the program rating of 600 W.  Perhaps it would be better to run the cabs in parallel in bridge-mono mode, in which case I think each speaker would receive 775 W, if I calculated this correctly (per the XLS 1500 spec sheet, it delivers 1550W at 4 ohms when in bridge-mono mode, so 1550W/2 speakers = 775W per speaker).