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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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Tweakers' Asylum Tweaks for systems, rooms and Do It Yourself (DIY) help. FAQ. |
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In Reply to: Room Treatment Question posted by Juan on November 9, 1999 at 23:31:28:
1. Your ear should tell you if you need bass traps. If the bass is boomy or has peaks then bass traps are called for. Also, you can simply walk around the room with your ear near the wall and hear if the bass energy builds up at any point. Stand back near the corners of the room and listen for build up of bass energy. But, have you first tried moving your speakers around to be sure that you're not exciting some room modes? You need to do this first becasue the first reflection points will change based on the location of your speakers. Check out the sugestions on the Cardas website for a starting point on how to place your speakers.2 and 3. The Auralex products appear not to be very good absorbers based on the absorption data which is presented on the auralex web site (see the page labeled NRC testing data). Firstly, they are not very dense (0.3 lbs/cu ft) and this is refelcted in the NRC data that is presented. Mounted on a wall the 2-inch panel does not provide significant absorption below about 500 Hz and the 4 -inch panel quits at about 300 Hz. Jon's DIY panels absorb to well below 200 Hz, a claim that I have verified using the ETF room acoustic program with my system.
All absorbers benefit from being moved out from the wall. Spacing a 1-inch panel 3 inches from the wall gives it the absorbance of a 2-inch panel placed directly on the wall. I suspect that Auralex suggests mounting their panels on the wall because the foam is not stiff enough to stand up on it's own. If you decide to go with the auralex and mount it on the wall use only the 4-inch stuff. Of course many find the appearance of the auralex stuff more to their liking than the larger DIY panels, but performance is the price to be paid.
For a fairly complete discussion of this, you might consider getting a copy of the Master Handbook of Acoustics-it fairly easy reading and will leave you with a good appreciation for what you need to accomplish.
I've also found a company, Acoustical Soutions, in Virginia which makes wall panels from glass fiber board which are reasonably priced and seem to be very good based on their NRC data. By the way for those of you building Jon's DIY panels, this company also sells the Guilford fabric that is used to cover the commercial panels. It's 19.50 per yard. Also, for those who are using decorator burlap and wish to fireproof it there is a company called Flameseal (http://www.flameseal.com) in Texas which makes a spray-on product to fireproof fabrics, its 30.00 per gallon. Good luck.
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Follow Ups
- Re: Room Treatment Question - Batman 05:04:41 11/10/99 (0)
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