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If you've never played there before, see if you can talk to the guy running the PA rig and ask what sort of levels he's expecting off the mixer.
Like ChrisB said, if they're doing their job properly the top of the mixer's output level is the top of the sound rig's capability. However, alot of sound guys run their rigs at full gain and use a compressor, and the DJ ends up having to keep the mixer turned down. I see this more often than I should. It's bad practice, adds unnecessary noise and encourages clipping. This practice has been exacerbated by the poor output stages of many DJ mixers, including the all-popular DJM600, which starts to distort way too early, especially if the XLR outs are not being used.
Limiting is good, but you want to avoid hitting the limiter if possible. It reduces dynamic range and flattens the mix. Some clubs keep the limiters tight to aim for a more constant sound level, but I'm not a fan of that. Music is meant to have ups and downs of amplitude and it adds to the feel.
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