If you like your sound it should work in most spaces... If you HEAR something wrong it is most likely a room resonance issue.
Just tweek your amp till you're happy again.
Also if you are in a corner try moving the amp away or closer to the wall or change it's angle.
This is most apparent on the bass register.
I have been a bass player for 30 years and this is more of an issue for us,
But the low end of C6 gets into the same general space.
I have been known to change sides of the stage with a bass amp
because the soundcheck bugged me. But generally a little change in placement and some slight EQ change will fix many problems.
In wildly reverberant or echoy rooms use less reverb on your amp.
Your back of the house comment is a toss up. If it sounds perfect at the back of a cavern it will likely sound annoying up front.
Just go with your sound, anyone interested will be up close, the others don't like it loud, are just looking for women, or a good drunk.
The sound in the room will change all night long as people come and go. The more packed the more dead, the more empty the more bright.
Outdoors a general good rule of thumb is that highs disapate much faster than lows, so it's better to drop the lows a touch, than raise the highs and get to strident.[This message was edited by David L. Donald on 19 June 2003 at 10:02 AM.]