Psychic, i have worked doing pro sound reinforcement for a living, sold pro sound gear for a living, recorded and produced a few local bands, etc... As such, i would consider myself QUITE familiar with all of the aspects that you have mentioned.
If you would take SPL measurements in the clubs that you think sound "great", you would find that the first thing that they did was to "neutralize" peaks and dips in the room due to its' specific acoustics. This WILL vary with how crowded the club is. That's why minor adjustments are needed on a night by night basis. Once the room is somewhat "flattened out", they will administer further equilization to achieve the tonal balance that they are seeking to achieve for that specific group of entertainers.
Most "metal" or "hard rock" will get tweeked at about 80 - 120 hz with a slight emphasis between 200 - 400 hz. This adds "weight" and "body". Depending on the venue and sound that the band was looking for, sinking the 1 Khz slider down will make the vocals sound more distant and "heavier". One might also elevate the 2.5 Khz to 4 Khz range, as this would let the guitars cut through with more "bite". If cymbals were weak, you would play with the 8 - 12 Khz range. Moving this will add or subtract "splash" accordingly.
On the other hand, acts with a lot of vocals would not want the same equilization as it would come across as being muddy at the minimum and possibly even sibilant or "spitty" sounding due to the upper mid boost.
Even with all of the EQ'ing that takes place, it is next to impossible to get even sound coverage in most halls. The speaker arrays are normally not well thought out, their dispersion characteristics are not optimized, the acoustics of the room are rather eratic and the density of the crowd varies drastically. As such, trying to go for a "flat response" would be a waste of time and typically result in HORRIBLE sounding performances as it would only be "flat" in a very few spots. Most folks would rather have it be "coloured" but sound pleasant.
All of that is why home audio and pro sound are so different. We know the venue that we'll be listening in, we know the acoustics, we know where the listener will be seated, we know the appr listening levels, etc... Since most of the variables have been removed, we can then attack the problems more completely and precisely with less side effects than if one was working on a much "grander" scale.
The bottom line is that Pro Sound and home audio have very little in common other than they both use electronics to amplify and reproduce the signal. Sean
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