📞 Call us for a free consultation! 520–392–9486, 8am – 6pm / Log in or Sign up / Contact
logo for room acoustics forum showing a waveform within a circle and the title of the forum
Avatar
Please consider registering
Guest
Search
Forum Scope


Match



Forum Options



Minimum search word length is 3 characters - maximum search word length is 84 characters
Register Lost password?
sp_Feed sp_TopicIcon
Guilford of Maine fabric: truly diffusive?
Avatar
Acoustics Pro
Members
Forum Posts: 21
Member Since:
February 15, 2017
sp_UserOfflineSmall Offline
1
May 7, 2019 - 10:08 pm
sp_Permalink sp_Print

Hey there Dennis and all!
I have been watching the Youtube videos created by Dennis and team (thank you… very informative!). Also, I have been reading the Handbook of Acoustics, 6th edition.
I am an engineer by trade, 20+ years, so I totally dig it.

So I have a question about the diffusion properties of fabrics, in particular, Guilford of Maine “Acoustic” fabric.
Does this fabric truly offer significant, meaningful diffusion properties within any range(s) of the audio spectrum?

How do the diffusion properties of the fabric compare to those of QRDs? Ok…. I shouldn’t even ask, but I have to anyway. Maybe you could use a laugh Dennis :)

Dennis – could you do a Youtube video on this topic? That would be really cool.

I am not sure if the diffusion properties of any cloth is mathematically calculable. Since I’m a math/science guy, I figure, don’t worry about the cloth material – just cover
the absorption panels with *something*, for aesthetic and health reasons, and use QRDs or other quality products for diffusion.

Thanks!

Jason
http://www.VoiceRanch.com

Avatar
Chief Acoustics Engineer
Forum Posts: 387
Member Since:
August 12, 2013
sp_UserOfflineSmall Offline
2
May 8, 2019 - 4:26 am
sp_Permalink sp_Print

J, Fabric or cloth does not exhibit diffuse characteristics. Creating a diffuse sound field within a room requires adherence to a set of very specific criteria including logarithmic decay and spatial irregularities in-room response along with other criteria. Cloth or fabric can not produce these requirements. It is a sound absorption technology. We have calculated with our units that it has around a 1 dB attenuation factor. This is why most people most do not use speaker grill covers. They hear that 1 dB impact especially with middle and high frequencies.

Avatar
Acoustics Pro
Members
Forum Posts: 21
Member Since:
February 15, 2017
sp_UserOfflineSmall Offline
3
May 8, 2019 - 9:54 am
sp_Permalink sp_Print

Thank you for clarifying, Dennis, much appreciated.

Jason

Forum Timezone: America/Los_Angeles
Most Users Ever Online: 31
Currently Online:
1
Guest(s)
Currently Browsing this Page:
1 Guest(s)
Forum Stats:
Groups: 4
Forums: 10
Topics: 357
Posts: 991

 

Member Stats:
Guest Posters: 23
Members: 14392
Moderators: 0
Admins: 2
Administrators: admin, Dennis Foley
FREE ROOM ANALYSIS
Call Us 520–392–9486
100% Money Back Guarantee