We never play gigs with just one FOH speaker. There is always a set of speakers on both sides, but that doesn't mean the system can handle stereo. Having speakers on both sides of the stage doesn't mean the system is in stereo. So those are the systems I'm worried about. When we use those, it's basically like having one speaker (even though there is one on each side). So I'm worried that in those instances, I'll get that garbage room/slapback/phasing sound.
Like i said, the mimiq is mono compatible. It will not gain you any bigger sound on a mono system but it will not destroy your sound either.