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I'm using avantgarde horn speakers and would like to dampen the metal tubes connecting the woofer to mid and high frequncy horns. bought around 2 kgs of lead shot but this is by far not enough. i bought almost the total stock of that store and would be difficult to find the amount I would need. I live close to the beach so sand is plenty and freely available. is sand a good substitute for lead shot?
Duomike
Follow Ups:
thanks for all the responses. I live in indonesia and i guess getting sanitized sand or other fancy materials would be difficult or impossible. due to the lack of choice i will go with beach sand. using different materials seems to sound like a good idea. unclestu, are you using avantgardes as well?
Duomike
This stuff is sold as cat litter and as oil absorber for auto shop and factory floors. It is lighter than lead or sand, and is an effective damper.
Consider the basic physics of a steel tube as a resonator. It will have organ-pipe modes, which filling will control. It will also have modes in which the tube resonates as a strut. Adding mass with the filling lowers the strut resonant frequency. A lower resonant frequency will be more difficult to damp with the filling material and through external means.
You might be successful in damping your tubes with tightly-packed rags torn into strips. These would add even less mass to the tubes. I've used polyester batting, sold in fabric stores as filling for quilts, etc., in tubes where granular material would have been difficult to fill and retain. It is a chore to get enough of it in through small holes and to pack it tightly enough to do any good.
If you don't mind the appearance, covering the outsides of the tubes with automobile body damping sheet, such as Dynamat X-treme, will also help quiet them. These sheets are sold to damp auto body panels, to improve after-market audio system performance.
That's what I'd do anyway. It's more dense and effective at dissipating energy than polyester while still being very light so that it does not alter the resonant frequency downward more than a trivial amount.
I realize some do not like working with fibrglass, but it's actually quite easy to handle safely (just cover all your skin and wear a cheap dust mask).
-Pete
stay away for sea sand which will contain salt. Salt and moisture can start corrosion of your metal. See if you can get sand from the bank of a fresh water river.
It contains salt, impurities, bacteria, moisture etc. which may affect the metal tubes of the Advantgardes. Sanitized play sand (for a kid's sandbox) is only a few dollars for a fifty pound bag.
Different fill material may well give your system different sounds. Filling the tubes will lessen some vibrations and augment others. For my Art Audio PX-25 SET amp stand, I have found the Star Sound Micro -Bearing fill material to improve my system's sound. The particle size is in the micron range- much finer than sand or lead. The people at audiopoints.com are a pleasure to talk to concerning vibration control.
Best wishes in fine tuning a wonderful horn system.
David Pritchard
of materials, as the lead shot is relatively large and it will have air space around the pellets. I like to use fine construction sand used for mortar mixes; it seems to be finer than the regular beach sand is is still relatively inexpensive. Added plus is that it is salt free.
In general though, I find that filling the legs asymmetrically with various materials sounds much better than using only one m material type for fill. In using one material type each leg becomes tuned to the same frequency, a multiple material fill gives you a broader bandwidth in terms of dampening.
Stu
I don't have your metal tubes, but my speaker stands and equipment rack are DIYed from copper plumbing pipes and fittings. Same issue of both damping and keeping the mass center low for stability.
So I found that filling them asymmetrically with multiple materials works very well all the way around.
I use from bottom to top:
1) BBs, essentially steel shot plated in copper it appears (not sure how they get the copper color on the outside, but that wasn't of any importance.)
2) Clean play yard sand (no salt or corrosives - a basic cheap construction material widely available.)
3) Kitty litter (clay granules.)
4) Polyester batting crammed in.
More or less, first quarter shot, second quarter sand (which will also drift down and mix with the shot to some degree and fill crevices), thrid quarter kitty litter, last quarter polyester.
Works for me. YMMV
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