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I am building a couple of 16” diy tube traps using the knauf pipe insulation tubes. I have a bolt of thin silk fabric used for kimonos that I picked up at a Japanese second hand store. I am wondering whether I should cover the tube traps with the silk or buy some burlap.Any thoughts on the acoustic effects of silk vs. burlap for tube traps?
Follow Ups:
I covered mine with cotton batting (to contain fiberglas fibers) and gray muslin. Muslin is like thin soft denim.
I also made mine from Knauf pipe insulation. It may not be the optimum density, but it works amazingly well. The room smoothed out better then I had hoped for. My son and I took SPL readings without traps and with traps. Ten freqs (25-200hz), 7 places in room, with traps and without traps(140 readings). The SPL readings confirmed our ears. I couldn't be more pleased with this DIY tweak. Using the Knauf pipe insulation sure makes it easy, but costs a little more (US$7.47 per foot).
Good luck with the Knauf pipe insulation, it is not optimal.As for the covering, burlap is recommended for several reasons:
1. It is inexpensive.
2. It does not reflect any particular band of frequencies, nor does it interfere with the bass absorption process.
3. It is readily obtainable.As for using silk, it is very likely that it will be reflecting more of the midrange, possibly some lower treble, especially at oblique angles.
Will it interfere with the bass trap action? Not likely.
But realize that a large part of what is possible with a good bass trap is the ability to ADJUST the room acoustics, by duplicating the ASC retail traps, and providing a partially reflective side, and a mostly absorptive side for the midrange and highs.
Turning the trap to diferent angles with respect ot the absorptive vs. refelctive sides, allows one to tuneor adjust the overall room acoustics.
If you ONLY want bass damping, then the silk will probably be OK, BUT, how do you know ahead of time that you only want bass damping?
You don't, so having the option is a good thing to preserve.See:
First article by J. Peter Moncrieff on how to place ASC tubetraps.
http://acousticsciences.com/articles/iar85.htmSecond article by J. peter Moncrieff on ASC TubeTraps
http://acousticsciences.com/articles/iar89.htm
Jon Risch
Jon,Thanks for your input and the url references. I read both articles. Good information. I am not sure I completely buy the ¼” makes a difference in focusing the traps but I am ready to be proved wrong. A few years ago, I didn’t believe that better power cords, interconnects, speaker cables, isolation devices, etc., would do much to improve the sound quality of my system. But, they have provided a significant improvement and I enjoy music much more because of it.
Many of the changes to my system began as proof-of-concept DIY projects to confirm that room for improvement existed from the change I was investigating. Power cords are my best example of this. I started out with a couple of Pass & Seymour plugs, Marinco IECs, and some Home Depot 10/3 SO. Now my system is populated with a combination of my own cords with audio grade ends and some commercial cords. The Knauf traps are my first venture into room tuning and may be the beginning of the same type of journey.
Do you have any suggestions to make the Knauf traps perform better? Would filling the tubes with additional materials help?
BTW, I have a pair of Martin Logan requests. Are there different rules for tube traps with electrostats?
Bill
Try putting a sheet for some of it in front, directly over your speaker and play music then pull it off/on, burlap is going to be less transparent and silk more.Think thin or thick.
I'd use the silk, but dusting and the like may ruin it.
Making the decision on the thin/thick criteria was my inclination as well. But, I was concerned about the higher density of the silk weave compared to the burlap’s looser weave. See Jon’s post below.BTW, the kimono silk is not fragile. It is very durable stuff.
Go with the burlap, it's not transparent. But then you don't care to listen to what's in your trap anyway.Or maybe you do?
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