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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: Foams as ascostic treatment? posted by Cliff Wee on May 3, 1999 at 08:36:52:
Mattress foam is not a good broad band absorber. It tends to absorb more of the midrange, and not as much of the highs, and a lot less of the lows.By using material that is not thick enough, and does not absorb enough LF's, (and often using a larger area of it, but not in your case) the room becomes too dead in the mids, and boomy from the imbalance of the highs to the lows. In your case, they just aren't thick enough, and are not absorbing enough lower mids and lows.
Since you have already bought the stuff, and need to make it work, here is the "mattress foam band-aid":
First, read my DIY Acoustics Treatment note (see http:/members.xoom.com/Jon_Risch/a1.htm) to find out about proper size and placement of an absorber.
Double up the mattress foam, get it away from the walls by at least a few inches, and then cover the front surface with a layer of 3/4 to 1 " thick polyester batting. This will restore most of the HF absorbtion, and increase the LF absorption, so that the absorbers will function in a more broadband manner. You could cover this in a grille cloth or burlap, as per my DIY note, or leave the polyester bare.
If you follow the band-aid recipe, and place them on the walls as indicated in my note, then you should get an improvement in your sound overall.
The doubled up size should be around 3 foot square, with six of them, I would try this first:
The primary points are: the side walls and the rear wall. Start with one doubled up foam square at the side wall mirror points, and in the center of the rear wall, the rear one centered vertically at listening height, the two side ones at the mirror point vertically for the tweeter.Then, with the remaining 3 pads, try placing one in the middle of the front wall, level with the speaker tweeters. Place the other two directly behind the speakers, centered vertically with the tweeter.
Then, try moving these three to other locations, either doubling up with the side wall units, and placing the leftover one on the rear wall, or placing two up on the ceiling at the mirror points, and leaving one on the front wall center point.
One of these combinations should do the trick for your room.
The real stuff in the way of framed fiberglass, batting and burlap would work even better, and would probably look nicer too. Oh well.
Jon Risch
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Follow Ups
- Re: Foams as ascostic treatment? - Jon Risch 19:28:00 05/04/99 (0)
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