Too much top end in clubs as a result of digital setups...

[Basil Rush]

Sound checks rule if you can get 'em ... for some reason (disorganisation probably), it's often not something that happens at live PAs these days...

[audioinjection]

well having too much top end probably is the fault of the dj or the mix from the tracks right? i assume most big rigs don't eq their set up, i dont know too much about huge rigs, but i doubt they eq the mains

[Symmetric]

The big systems should be eq'd. Although around here it seems when a rig is used for an electronic event, it's often not sent with one of the company's top engineers, so it's not always eq'd right, if at all. But even if a rig is set up properly, if the event is primarily vinyl, when someone switches to cd's or laptops there is a noticeable sonic difference between mediums.
Regarding soundchecks, even if you don't have one scheduled I've found that if you can get to the venue when sound is being set up, most of the time the audio engineer is happy to sound check you, and if he's good it gives him (or her!) a chance to rinse out the system. If you're playing a club on a fixed system you usually don't get that luxury though.