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i heard stuffing fiberglass or sand as well can help absorb the lower frequencies under 100hz.
http://www.audiokarma.org/forums/showth ... p?t=402980Inside I could also put a 3 ft section of 12" dia. concrete form capped on both ends and filled with fiberglass as well, just to break up the waves a little more. The 12" form could also be filled with sand instead of fibers.
http://forums.musicplayer.com/ubbthread ... cs/1659617bass traps with high visual appeal
http://www.gearslutz.com/board/product- ... ppeal.htmlAnother way to prevent low-frequency sound bouncing is to interrupt it with a heavy but non-rigid surface. Here the principle is the same as when bouncing a ball off concrete and then trying to bounce it off dry sand. Clearly the ball will bounce higher from the concrete than from the sand. (In fact, sand can be quite a useful acoustic material
http://www.soundonsound.com/sos/feb06/a ... diosos.htmUsing mass to stop sound entering or leaving the room is one method: cement walls or brick walls filled with sand are good ways of doing this, and act as low-frequency bass traps also. The most effective method of sound isolation is to create a "floating room."
http://www.ehow.com/about_6580702_acous ... tudio.htmlA down firing subwoofer pointing to a riser filled with sand is a option?
http://www.avsforum.com/t/255432/acoust ... hread/92708" sonotubes filled with sand will do almost nothing for your low end. Just go with tried-and-true bass trap and/or broadband absorber designs.
http://www.gearslutz.com/board/studio-b ... tment.htmlI built some stands for them which are basically columns made from 1/2" thick MDF 3 feet high by 10 inches by 10 inches and filled with sand to isolate the speakers. I based the height of the stands on having the tweeters at the same level as my ears when I'm sitting down.
http://mediamusicforum.com/home-studio-acoustics.htmlוגם זה
http://www.soundstage.com/revequip/duvall05.htmוזה
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