Absorbers are measured in a specially designed acoustically hard room - a reverberant chamber is the opposite of an anechoic chamber. You have to excite the room (probably with octave band pink noise) and measure the RT60
Without a reverberant chamber you can only measure RT60 in the room before and after install. Read up on Sabine.
With a diffuser you could measure the spectral return (impulse) of a flat piece of material the same size as the diffuser in an anechoic chamber, then you could measure the return of the diffuser at various angles of incidence - it would be a lot of data.
Without an anechoic chamber you could try gated measurements, but I think they would be very difficult to interpret.
In all cases above, you would typically want measurements from multiple microphone locations and elevations.
Without a reverberant chamber you can only measure RT60 in the room before and after install. Read up on Sabine.
With a diffuser you could measure the spectral return (impulse) of a flat piece of material the same size as the diffuser in an anechoic chamber, then you could measure the return of the diffuser at various angles of incidence - it would be a lot of data.
Without an anechoic chamber you could try gated measurements, but I think they would be very difficult to interpret.
In all cases above, you would typically want measurements from multiple microphone locations and elevations.
Hi lesionaire,
Bill Waslo's diffuser web page (Depot Diffuser construction) lists two links that may be of help.
Software - AFMG Reflex
DIY Sound Diffusers FAQ
Peter
Bill Waslo's diffuser web page (Depot Diffuser construction) lists two links that may be of help.
Software - AFMG Reflex
DIY Sound Diffusers FAQ
Peter
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