While I'm enjoying this food fight, might I throw a thought out...?
The human brain is quite a bit faster than sound waves. It adapts to it's environment. While a delay might be perceptible to an instrument trying to record it, the brain will overcome it, and adjust to it. The sound stage could become less or more, but the brain will compensate for that.
It's really only a theoretical argument, and I don't believe it has any realistic effects in a DJ show, other than whether you have more thump or not depending on placement...
Just my thoughts -- continue throwing food