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Background music or dancefloor?
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Last restaurant venue I used around 4.5kw of amplification. It ended in a lock in and I could feel the mixer surface bouncing with the bass pressure. :) By the time I reached that stage there's limiting for speaker safety and eq on 6 different speakers to tune the PA to the room. It's the kind of situation that suits the ZXa5 perfectly (1250w each). I've done it with just them and it's almost too easy. They have no internal limiting though so it's easier to fry a driver. Minimum I'd want to have would be 400w, you'd be pushing them most of the night though. Problem is you get a few bodies in front of the speakers and the sound drops off quite fast.
Problem with an 80w setup is clipping at the amp burning up the speakers.
You don't need a huge system to rock a pub, its just easy to get carried away as the gig progresses. Sometimes a small rig is easier as you don't get increasingly deaf.
If you're playing records you need to keep a careful eye on the mixer, most DJ's will start clipping the outputs on the mixer as they try to emphasise the tracks, then you end up hitting the max input for the amp.
I would never discourage anyone from trying their hand at PA stuff but it's a learning curve and there's more to it than meets the eye. I'm in no way an expert but I do enjoy it.
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Dramatic_Hammer
Airhead
@BRM
@Airhead what will i need for a party in a pub?
will 2x 1210s, a mixer, my pioneer (c80w) amp and tannoy eatons have enough welly? they would destroy my front room at full whack , but a small pub floor might be a different story