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any recommend of C80 value?
PostPosted: Tue Dec 05, 2017 6:11 pm Reply with quote
ah82318
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Joined: 22 Nov 2017
Posts: 5




Hi: I have a project of small live house acoustic performance, the music type of bands play in the live house was rock, punk, post rock, pop...etc.
I want to know the suitable C80 value for the rock music. In EASE tutorial, the recommend value was6+/-2dB, but I didn't see the value come from which reference.
any reference for recommend the value which was suitable of rock music? Very Happy
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PostPosted: Tue Dec 05, 2017 8:15 pm Reply with quote
Alexis
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Joined: 12 May 2009
Posts: 9




Hi!

the original paper where this parameter is described is in german, but there must be a proper translation, anyway here is the name:

[Abdel Alim, O.:Abhängigkeit der Zeit- und Registerdurchsichtigkeit von raumakustischen Parametern bei Musikdarbietungen (Dependence of time and register definition of room acoustical parameters with music performances) Dissertation, TU Dresden 1973

For what I know a good value for modern music should be over +6dB.



Best



Alexis
https://acusticaenespanol.blogspot.de/
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PostPosted: Tue Dec 05, 2017 11:51 pm Reply with quote
thomas
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Joined: 16 Mar 2011
Posts: 52




Hi,
you can't find anything about rock, punk, post rock in the original paper, mentioned by alexis. But it is interesting to read anyway.

In the EASE Help I find:
Quote:

Appendix A: Acoustic Formulae > Room-acoustical Fundamentals for Auditoriums and Concert Halls (reprint of chapter 6.1 and 6.2 of AHNERT/TENNHARDT/6.0/) > 6.2 Room-acoustical Criteria used in AURA, Requirements > 6.2.2 Energy Criteria

...

The value for a good clarity measure C80 depends strongly on the musical genre. For romantic music, a range of approximately
-3 dB <= C80 <= +4 dB
is regarded as being good, whereas classic and modern music will allow values up to + 6..8 dB.
According to Höhne and Schroth /6.14/, the perception limit of clarity measure differences is about &#916;C80 &#8776; ± 3,0 dB.


I think the values of +4..+8 dB should be proven with the PA, not with a sphere (striktly speaking C80 is defined for a sphere) and for the 1kHz Octave (with a positive increase over the frequency, no decrease should occur at least).

Thomas
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PostPosted: Wed Dec 06, 2017 11:53 am Reply with quote
Agustín Arias
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Joined: 10 Apr 2013
Posts: 28
Location: Caseros, Buenos Aires, Argentina




You should read the book "Rock and Pop Venues: Acoustic and Architectural Design" of Niels Werner Adelman-Larsen
Niels is an excellent reasercher and acoustician, I met him in the ICA 2016 in Buenos Aires. You can contac him via facebook for any questions you have

_________________
Eng. Agustín Arias
Environmental Protection Agency, Buenos Aires, Argentina
Ottobre & Ottobre, Acoustical Consultants, Buenos Aires, Argentina
e-mail: agustin.arias@outlook.com
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any recommend of C80 value?
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