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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: Generally speaking, what is the best size shot posted by 1musiclover on December 8, 2004 at 09:05:56:
Unless you need to lower the center of gravity, simply adding mass with heavier materials is not a good idea. The rack frame members have a resonant spectrum determined by their mass and stiffness. When you add a filler, you provide some damping but you also increase the mass of the total structure without increasing the stiffness.The result is the resonant spectrum is shifted down. Even with the added damping, the total motion may be increased because of this shift. This may make the audio consequences worse instead of better.
You might want to consider using a lighter filling material. I like clay oil absorber, that looks like kitty litter, because it couples well to rack frame metal, but is lighter than sand. Polyester batting is very light indeed, but does not couple well to steel rack tubes in my experience, even if firmly packed into them. Polyurethane construction adhesive (less than $3 per tube in the big-box home improvement stores) dries to an acoustically dead hard rubber. If you could contrive to simply coat the insides of your rack frame tubes with this stuff, it might work better than any passive filling. In any case, it is good for caulking the joints where the dust from the filler might leak out.
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Follow Ups
- Consider the effects of adding mass... - Al Sekela 17:10:59 12/08/04 (1)
- Thanks Al. Good thoughts. (nt) - 1musiclover 17:13:54 12/08/04 (0)
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