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Re: I need some help with room analysis and treatment…
michael_d #252867 03/20/09 08:19 PM
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Just a question. Why are you using foil faced insulation?

Re: I need some help with room analysis and treatment…
onn #252869 03/20/09 08:25 PM
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I think you want fabric that approximates "acoustically transparent" or it will defeat the purpose of using the fiberglass.


bibere usque ad hilaritatem
Re: I need some help with room analysis and treatment…
onn #252870 03/20/09 08:25 PM
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Ethan told me to. \:\)

Just kiddin. The link Randy posted above to Ethan's page discusses the merits of foil backed pannels.

Re: I need some help with room analysis and treatment…
michael_d #253222 03/23/09 11:58 AM
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 Originally Posted By: mdrew
That’s also where I’ll have to find some sort of fabric to cover them with.

Anyone see a problem with this approach? Should I just get enough of this stuff for side wall traps too? What is a good, reasonably priced fabric? Velvet is pretty expensive…..


Some acoustic companies use burlap - ATS Acoustics Burlap

Re: I need some help with room analysis and treatment…
davidsch #253232 03/23/09 12:52 PM
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Thanks!

Is that something that's found in a fabric store?

Re: I need some help with room analysis and treatment…
michael_d #253275 03/23/09 05:16 PM
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I can't say that I know that answer. A phone call to your local fabric store may help though.

Re: I need some help with room analysis and treatment…
davidsch #253431 03/24/09 05:24 PM
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After an hour wandering around a fabric store, the only material I found that wasn’t $30 a yard or more, and didn’t look like something you’d find on a prom queen’s dress or down comforter, I walked out with some material similar to Carhats. Of cource they didn’t have it in black though. Next time I need fabric, I’m sending the women. What an awkward experience that was….. A very nice elderly lady took pity on me as I was walking around like a zombie and helped me find the stuff I ended up buying.

I’m going to start building these boxes today. I never gave any thought to what material I should use on the back side. I was planning to just staple some ¼ plywood to the backs to enclose the fiberglass, but also give them some strength. Now I’m wondering if that’s such a good idea. It shouldn’t matter, will it??? Anyone??

Re: I need some help with room analysis and treatment…
michael_d #253435 03/24/09 06:09 PM
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That will probably change the performance a little, but I can't remember exactly how.

For the two traps I built, I just split the plastic bag the acoutic sheets came in in half and used that as a backing to keep the glass in.

By the way, now that you have gone through your fabric adventure, muslin is very acoustically transparent and inexpensive. I don't know if you can find it in black though.

If you want to know how the plywood backing will affect your trap, check out the Home Audio Acoustics forum at hometheatershack.com. The guy who moderates it and answers most of the questions does room treatments for a living and is very knowledgeable.


Fred

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Blujays1: Spending Fred's money one bottle at a time, no two... Oh crap!
Re: I need some help with room analysis and treatment…
fredk #253443 03/24/09 06:25 PM
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For the frames, a biscuit joint works great and lets you leave the back open. Then just staple the fiber to the inside edges. If you don't have a biscuit joiner, you can still just cut a slice in the corner and put a biscuit (cheap at HomeD) in and glue it up. Saves time and, more importantly, weight, without adding a reflective back. Just and idea, worked for me.


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Re: I need some help with room analysis and treatment…
Zimm #253448 03/24/09 06:39 PM
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The custom Art option is a huge improvement over the burlap otherwise available. To date, I have seen nothing that makes it worth buying these pre-made. But the ability to actually cover it with OK art might be worth the huge markup on the actual trap. Thanks for the site.


Panny 3000 PJ, 118" Carada, Denon 3300, PS3, Axiom QS8, PSB 5T, B&W sub, levitating speaker wire
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