Acoustics for Coliseums

[sergioTOOL]

Hi

I have been trying to get information re. acoustic conditioning in
coliseums for music performances, but so far I have found pretty much
nothing.
There is plenty of info for theaters/auditoriums.
I assume that installing reflection panels at the roof along with
absorption panels (to control first reflections and rev time) might
improve the acoustics, but that´s just a rough idea form the top of my
head.
Does anybody know where to find accurate info... a book, website or
paper they can share?

Cheers
Sergio

[Angelo Campanella]

sergioTOOL wrote:
> I have been trying to get information re. acoustic conditioning in
> coliseums for music performances, but so far I have found pretty much
> nothing.

The size matters. Conventional ancient amphitheaters, seating perhaps
2500 persons was their solution when no amplification was available. I
believe that the the back wall was the only aid, along with a husky
voice. But I presume that your question is not about amphitheaters.

> There is plenty of info for theaters/auditoriums.
> I assume that installing reflection panels at the roof along with
> absorption panels (to control first reflections and rev time) might

> improve the acoustics, but that愀 just a rough idea form the top of my
> head.

My observation of coleseums is that the overwhelming majority of such
projects depend solely on amplification means, whence the huge audio
systems industry that practices it. There, loudspeaker coverage,
loudspeaker "echoes" and feedback become the dominant parameters. A huge
amount of anectdotal information is available, wherever the audio
systems practitioners authors care to share their experiences. But I see
no controlling model emergent so far. It's an empirical free-for-all in
my eye.

Reflectors are meaningful when preservation and redistribution of human
voice sound power is effective or meaningful, r at all pertinent.

Furthermore, as we all know "close mic'ing" overcomes essentially all
feedback issues. (I have long predicted that the cosmetic and invisible
head mic will dominate this issue, since it allows the greatest
acoustical gain.

> Does anybody know where to find accurate info... a book, website or
> paper they can share?

The Audio engineering Society is the only place that one might find
some credible documentation.

(All my personal opinions.)

Angelo Campanella