More bass trap questions.

[Todd24]

Hey guy!

This site rocks for the info.

I have a bunch of moving blankets. I want to take them down in my rehersal/recording space and do some real treatments.

The thing is I cant help but notice how dense they are, and I wonder if I could build a frame stuffed with moving balnkets for use as a bass trap. This way they still get used.

Do you see any problems with this idea?

Also what do you think about leaving a small space between the layers of blanket? would this help or hurt?

Thanks!

[Glenn Kuras]

Originally Posted by Todd24

Hey guy!

This site rocks for the info.

I have a bunch of moving blankets. I want to take them down in my rehersal/recording space and do some real treatments.

The thing is I cant help but notice how dense they are, and I wonder if I could build a frame stuffed with moving balnkets for use as a bass trap. This way they still get used.

Do you see any problems with this idea?

Also what do you think about leaving a small space between the layers of blanket? would this help or hurt?

Thanks!

Sure it would do something, but if you take a string and 2 tin cans that would work as a telephone also. Sorry man not trying to be mean but really if you want to do it right then you want to either think about buying proven bass trapping or build them out of rigid fiberglass or mineral wool. Anything else is going to be a shoot in the dark.

Glenn

[tINY]

The moving blankets would work - maybe not as well as insulation. But. you'ld need to at least double them up (4 would be better) and hold them out from the corner of the room and treat all the corners and a lot of the walt-to-ceiling corners.

You'd need, like 80 - 100 moving blankets. I think you'd do better selling them on EBAY and getting OC703....



-tINY

[big country]

if you stacked six blankets and but them in a box frame it would probly kick ass.
never done it but the theorys thier.

[Todd24]

Well....being this is low end theory....and me being cheap and all.....I hate to just toss them. ( I doubt theres a market for crappy old blamkets)

I do intend to buy the 703 as well. If i understand it all right denser is better (so long as air moves through) right?

Then if so the blankets should do well. Im going to try it.

[Scott R. Foster]

Tod:

Can you blow air through the blankets... if so, you could use them for upholstery. I doubt they are suitable for the meat of a broadband absorption panel.

For the filler, denser aint necessary better... it depends on a number of factors. 3 lbs pcf semi-rigid fiberglass board [such as 703] is an excellent choice, and a good value.

Rockwool stuff above about 4.5 lbs. pcf is also very good, and even denser rockwool is often an excellent value and works very well. I think GIK uses 8 lbs. rockwool, and these units post excellent absorption numbers.

Shop you local market for the best in those material classes and you'll be fine.

If in doubt you can probably find numbers reasonably applicable to any product you find at this site:

http://www.bobgolds.com/AbsorptionCoefficients.htm

shop for price.. and material class... not brand name.

Good Luck!

[Todd24]

I found 2" 703 For $1.08 a sq ft locally. Might as well pick some up and experiment with both. I will post my mostly unscientific findings when I get this all done.

[chief lutt]

Originally Posted by Todd24

If i understand it all right denser is better (so long as air moves through) right?

it should work in theory. how well...i don't know. if you really want to find out take measurements...before and after. my friend did not have any furniture when he moved to his new place and his piano sounded muddy and echoey (no curtains, no furniture, tiled floors). one day he bought blankets and towels at the thrift store and stuffed them all at the top most shelves and the difference was like night and day (light curtains still no furniture). now with the furniture in place he likes it just fine. furniture will have an effect on sound. especially those made of fabric, foam and polyester batting. fabric? polyester batting? like blankets? yes! try it...it might be enough. radio shack sells inexpensive spl meters. take measurements before you put your blankets in place and then again after. you'd need an spl meter anyway whether you go with the blankets or glass. good luck and let us know how it turns out.

[Glenn Kuras]

Originally Posted by Todd24

I found 2" 703 For $1.08 a sq ft locally. Might as well pick some up and experiment with both. I will post my mostly unscientific findings when I get this all done.

For bass trapping make sure you make that stuff 4" or more. I myself would go with 6" to make sure or fill the corner with it. Check out http://messageboard.tapeop.com/viewt...r=asc&&start=0 for talk we are having about different products to use.

Glenn

[Todd24]

Excellent replies guys. Much appreciated. I have been reading everything I can find.

Right now I have a big peak at around 50-55 and a 20db or so null at about 100ish. It really depends on where I stand or sit.

Sadly the Insulation store is doing inventory today which kills my plans

[Rev. Robb]

I am a huge fan of OC 703. In my 10X12 standard bedroom I added a dozen 2X4 OC 703 panels (4 inch thick). WOW, night and day difference!! These panels have enabled me to learn how to mix…