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RE: Division of labor in PA system-More

Okay not trying to dispute you here, just trying to understand. I'm not sure the RTA readings back in the audience area will correspond directly to nearfield SPL readings from the speakers.

In a modest indoor venue setup (no line arrays or flying J-arrays), aren't most of the audience going to be in the farfield, where the reverberant energy is dominant? If so, I think we should take the directivity of the mains into account (chances are the subs will be a lot less directional than the mains over their passband).

So if your RTA reading is taken from out in the audience (indoors), and the mains have an average directivity index of 10, the farfield response will be a lot higher in the bass than in the mids and highs assuming we started with "flat" nearfield response. This could account for most of the bass emphasis your RTA meter is showing, could it not?

I'm not sure what frequencies are most readily absorbed by the people & furnishings in the room, but that might be something to consider as well. If the shorter wavelengths are selectively reduced in the reverberant field, that would again contribute to a bass-heavy RTA reading back in the audience even if the nearfield readings started out "flat".

Maybe in the real-world these mechanisms do not play a signficant role, so correct me if I'm wrong.

Duke


Me being a dealer makes you leery?? It gets worse... I'm a manufacturer too.

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