davedotco said:
All electric instruments are amplified and played through loudspeakers. In an indoor concert only a spall proportion of what you hear from the electric instruments comes through the PA (sound reinforcement) system, the vast bulk of the sound that you hear comes directly off of the stage, ie the guitar amps and the rest of the backline.
Not these days.
The stage is a pretty quiet place now, artists want to preserve their hearing. In any venue of a decent size, backline couldn't hope to fill the place with sound without PA so why bother at all and it avoids much of that feedback nonsense too. To hear themselves, artists use a combination of in ear monitoring, foldback, and side fills flown in the wings. The mix they hear will generally be a different one to the mix that the audience get to hear and will be mixed by a different engineer to the FOH engineer who's job is to ensure that everyone in the audience can hear reasonably well, otherwise people start complaining and demanding their money back. There are also health and safety considerations, i.e. limitations on the allowable spl, meaning that the line arrays are invariably flown and focussed to distribute the sound evenly - if most of it came from the back line, the people in the front rows would get deafened so that the people at the back could hear.
The exception, as alluded to above by James, are the bass bins which are usually stacked on the ground, left and right of stage - these are felt more than heard and can be very uncomfortable if you're too close.