Australians! EcoPink Rigid Glasswool panels (acoustic treatment)

[barbital]

Well, I had a look and I've come up with an insulation company that might produce the best acoustic treatment material around.

I had a look at the specs on the rigid panels and the co-efficient is 0.33 at 125Hz for a 2 inch panel. This is better than Roxul or Owens Corning for their 2 inch panels

I would imagine that it isn't cheap but it would do a superb job. I'm still going to ask them tomorrow for the pricing if I can get them on the phone. I will report on my findings

Ben

[pianoman]

...and in the "alternatives to OC" department, I came across "Ottawa Fibre Group" www.ofigroup.com. Their data is quoted in http://www.bobgolds.com/AbsorptionCoefficients.htm. For their OFI-48, which I believe is comparable to OC703 (3lbs/cu.ft. if I understand correctly), their absorption coefficient at 125Hz for 2" is 0.21, c.f. 0.17 quoted for OC703 or 0.16 for OC705. For 4" at 125Hz, OFI-48 is quoted at 0.92 c.f. 0.84 for OC703 and 0.75 for OC705. Based on these numbers, the material seems promising. OFI even quotes below 125Hz -- for 100Hz 0.69 and for 80Hz 0.55 for 4"thick (although significantly worse for 2" or 3").

Does anyone have experience working with this material? Living in Ottawa, this would appear to be a first choice for me (new info to me!), all other things being equal.

[Reza]

Thanks for the heads up!

How does this compare to the 'Tontine Fibres' Acoustisorb do you think? It's a non-fibreglass alternative, which I've heard good things about.

I'm finally wanting to build all my panels (broadbands and bass traps) this month... after talking about it for what seems like forever - and need to make a final decision.

I live in Sydney.

Cheers.

[barbital]

If anyone in Australia wants to get in touch with EcoPink their website is right here:

http://www.ecopink.com.au

So if anyone is interested in trying their luck with these guys, just click on the link and ring them on the phone. You never know, you might just strike the jackpot

Ben

[Ethan Winer]

Ben,

I've come up with an insulation company that might produce the best acoustic treatment material around ... the co-efficient is 0.33 at 125Hz for a 2 inch panel. This is better than Roxul or Owens Corning for their 2 inch panels

Don't be too quick to jump to conclusions. If the EcoPink stuff is based on rigid fiberglass or rock wool, it's probably very close in performance to the other brands. Measuring absorption is not nearly as precise as measuring the frequency response or distortion of gear. Results for the very same material measured at different times in different labs can vary as much as 50 percent at 125 Hz. In my experience, most insulation / absorbing materials are more alike than different.

--Ethan

[pianoman]

Originally Posted by Ethan Winer

Ben,

Don't be too quick to jump to conclusions. If the EcoPink stuff is based on rigid fiberglass or rock wool, it's probably very close in performance to the other brands. Measuring absorption is not nearly as precise as measuring the frequency response or distortion of gear. Results for the very same material measured at different times in different labs can vary as much as 50 percent at 125 Hz. In my experience, most insulation / absorbing materials are more alike than different.

--Ethan

Two pieces of very interesting information from a person who would definitely know:
(1) Like performs similar to like and
(2) different measurements of like differ.

I'm sure this has been done to death (although my first primitive search didn't get me what I'm interested in). Could someone possibly point me to a reference/thread/etc. which details the different measurement techniques which give different results, or, alternatively, outline the measurement techniques used and the error bars/reasons for discrepancy?

[Ethan Winer]

Originally Posted by pianoman

Could someone possibly point me to a reference/thread/etc. which details the different measurement techniques which give different results, or, alternatively, outline the measurement techniques used and the error bars/reasons for discrepancy?

Start here:

www.realtraps.com/art_measure.htm

Follow-up questions are gladly answered.

--Ethan

[Glenn Kuras]

also we talked about this some at
http://messageboard.tapeop.com/viewt...r=asc&&start=0


Glenn

[Ethan Winer]

Originally Posted by myfipie

also we talked about this some at http://messageboard.tapeop.com/viewt...r=asc&&start=0

Yeah, that was a great thread, and I spent a lot of time there explaining some of the finer points of acoustic testing. Though it sure was a shame to see unethical folks post misleading info. It's tough enough for you and me to explain the importance of acoustics and treatment, without dishonest people coming along and clouding the issues.

--Ethan

[aussie_techie]

did you get a price on these?

[barbital]

50mm thick 2400mm x 1200mm panels, 48kg/m3 density, 4 in a pack, $212.

Piece of cake. If you cut these panels into symmetrical quarters, you get 1200 x 600mm (4' by 2') panels, so you can turn those 4 panels into 16 panels.

This is equivalent to getting 16 panels of 2" thick 4' by 2' Owens Corning 703 fibreglass. Or 8 panels of 4" thick (100mm) if you're interested in doubling the thickness which is what I'd recommend for bass traps.

So that's like $212 AUD for 8 panels of 4' by 2' Owens Corning 703 at 4" thick. Not bad at all.

Ben