[PaulP]

The BBC did a lot of research into studio acoustics since the 60's and have made numerous reports available on the internet. They're not always easy to locate though, so I figured I'd provide that information here.

The entire list of documents, covering a lot more than just acoustics, can be found at : BBC Complete list.

If you search within the document for things like absorber or diffuser you get many hits.

The documents themselves can be be found at : BBC Reports.

Here is a list of the ones I've found most useful :

RD 1969/16 The measurement of sound diffusion index in small rooms

RD 1971/15 Low-frequency sound absorbers

RD 1978/27 The variation of absorption coefficient of absorber modules with ambient conditions

RD 1980/12 An investigation into the mechanism of sound-energy absorption in a low-frequency modular absorber

RD 1981/8 The effect of fabric coverings on the acoustic performance of modular absorbers

RD 1982/8 The design of a new wideband modular sound absorber

RD 1987/15 Theoretical and practical aspects of the Functional Absorber method of arranging sound absorbing panels

RD 1988/5 The development of prototype sound absorbers with variable characteristics

RD 1990/15 The design and application of modular acoustic diffusing elements

RD 1992/10 The design of a modular sound absorber for very low frequencies

RD 1992/11 A modular wideband sound absorber

RD 1995/1 Modular acoustic diffuser : The development and performance of a modular acoustic diffuser

Happy reading.

Paul P