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i think the aw value was in the "acoustic performance" report... obviously they intend to have it used for acoustic absorption as well as insulation... just like 703 and other rigid insulation products have acoustic, insulation, fire rating, VOC, etc... type data

aw is the "weighted sound absorption value" (the "a" is normally the Greek letter alpha). its generally related to speech intelligibility and is a coefficient, not the same as NRC. I believe its related to "SPEECH-INTERFERENCE LEVEL (SIL)" or "ARTICULATION INDEX (AI)"...

neither does the patent office... the patent process in the US is pretty much broken with people having patents that sometimes are nothing more than a variation on an existing patent, or worse, something never patented but commonly used or already significantly in existance. some patents have...

i was also wondering beside subjective sound quality, any room measurements regarding frequency response, reverberation, modes, etc?

yes. i'm familiar with it.

i would go with Bryan's advice on using a single room. if you felt you had to have isolation, then you could either build a vox/drum booth, or split the space on an angle - one side being the CR and one being the "booth/live room". since you're building it with metal frame, you get some benefits...

Rod being a certified fire safety engineer, as well as having many other excellent skills, tends to get worried/excited when noobies are building things that will likely get them and/or someone else killled... :eek: so I recommend taking Rod's advice with the urgency in which he gives it... like...

Middle Atlantic rails are pre-threaded. you can get them from a variety of sources. Amazon is one.

take a look at Ethan Winer's site - look for the Art Studio page which he created along with Wes Lachot regarding positioning of treatments.

invest in the rigid fiberglass. if not: the soft foam isn't going to work on anything except high frequencies. you could use small amounts of it (ensure its fire retardent) to break up echos on flat walls and ceilings by creating a 2-3 rows in a checkerboard pattern of 50mm x 60cm x 60cm...

you can use R13 or R19 (pink stuff) for the walls and ceiling (assuming 2x4 walls and 2x8 or 2x10 joists). if you can get RC-1 or RC-2 (instead of furring strips or hat channel) it will help with your isolation and reducing impact noise. 5/8" is better than 1/2" for mass. two layers will be even...

and remember to treat it with a fire retardent solution - spray on or dip.

http://www.realtraps.com/art_room-setup.htm there's some basic math to calculate first reflection points.

centering the mix position, try to get acoustic symmetry, treat the corners with bass traps, treat the key reflections points, front, side, ceiling, and back with absorbers. get a smaller bed, you're not going to be sleeping anyways... :)

any diffusion is likely to be at 6Khz and up due to the small protrusion of the block edges and the dimpling on the surface.

in practice, the porous absorbers are working on multiple velocity losses rather than solely on a single wavelength, so a 4" absorber 4" from the wall has effect all the way down to < 100hz. adding a limp membrane to the front changes the dynamic somewhat (as its now partially a panel absorber)...

you might be able to go with R-19 (typically 5 1/2" thick) unfaced and cover that fire retardent cloth. if you used the faced insulation, you will likely need to enclose it in drywall or ceiling tiles. check the fire safety rating on the material. generally an "A" rated ASTM C 665 insulation...

density wise, the glass is probably higher than the cement which would seem to be a good thing. it would be helpful for glass block manufacturers to post complete acoustic data instead of postulating that their product will meet some standard for sound insulation...

at high frequency it should do an ok job but the lower limit on published specs is typically 125hz... if i had to hazard a guess, it would be less than brick or block and even less than a proper drywall structure. also, structure borne noise will cut right through the glass (like brick or block)...

the angled walls only help with the flutter or slap echos. any room by definition will have standing waves/modal resonance/etc... a rectangular room is just easier to compute these things wereas a non-parallel set of walls will skew things and in some cases potential make it worse. generally...