Do you really need stereo in a live show? Aren't pretty much all club sound systems mono anyway?
-- the-erc

Depends. If you're talking about a dance club, then yeah...most of those systems are summed-down to mono before hitting crossovers for the frequency division to the amps for the different driver sections, especially in the low end. However, if you're talking about a venue that primarily deals with live music, those DO tend to be stereo quite a bit of the time.