Originally posted by Dennis Erskine
The location of absorptive materials (except in certain cases in small venues) has no impact on the RT60
You REALLY shouldn't say that:
Look at picture (copyright) below:
Measured by me in official University Lab.
Method as per ISO 354 - standard reverberation room method (except for position) on the same day with exactly the same rigid rockwool slabs framed with very light metal frame to screen off edges.
You could almost ask: which one do you like best.
So the only varying factor is the position in the room and how it's used.
Also look here:http://www.ib-neubauer.com/Literatur...001_Rome_1.pdf
Predicting Reverberation Time: Comparison between Analytic Formulae and Computer simulation with CATT room acoustic program.
Sabine and Norris Eyring assume statistical distributed absorption, boundary conditions and reflections.
Millington allows assymetric absorption.
Fitzroy and the improved Higini Aray Puchades approach try to solve the shortcomings of the above approaches in function of assymetric distribution of absorption.
An official Reverberation Room is tuned with added diffusers to the MAIN material sample spot.
There is the edge effect and so much more.