A common problem in club sound systems is that the full range outputs from the PA go to the x-over so everything with any low end content ends up in the subs. While there is low end content in vocals & guitar, they don't need subwoofer support. Ideally the subs should be fed a separate signal from either an aux or subgroup send so that only the things that NEED subwoofer support (kick, bass, *maybe some slight keys*) actually come out of the subs. That will clean up a lot of the muddiness and your stage sound won't be competing with all the other crap in the subs. Unfortunately it makes for a more complicated setup than a lot of club owners are willing to take on.Many places that have subs are using multiple subs in a variety of spacings which wreaks havoc on the lows...or depending on the club, my speakers are capable of cleaner louder lows than the washy mess of cheap underpowered subs.
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Built a sweet rack out of the extra wood from the 4x8 too.