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Old 9th January 2013, 02:07 AM   #1051
xrk971 is online now xrk971  United States
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Ok, where is a good place to get inexpensive wool felt then? Is there something magical about wool vs synthetic fibers for damping?
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Old 9th January 2013, 12:42 PM   #1052
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The stuff Planet10 and others are using is the ultratouch denim insulation. The company, bonded logic, has a dealer locator. HD has it online, Lowe's and menards may have in store.

I feel like a billboard...
Green building supply stores are carrying it also.
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Old 9th January 2013, 01:28 PM   #1053
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Thanks for tip on the material Zayne. The Ultratouch denim is really cotton then. The latest build pics on the FH3 vs DTB appears to be using real thick wool felt. Where do you get that stuff? Is there an advantage of wool vs cotton vs polyester, and what about special microfiber polyester which has a very high surface to area ratio?
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Old 10th January 2013, 05:24 AM   #1054
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For your viewing pleasure: Henkjan's desktop TL in foam board.

Compared to my cornus, these are much more quick-and-dirty, however I am much more pleased with the result. I'll definitely be making a real pair as soon as I am able.
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File Type: jpg Desktop TL 1.jpg (868.9 KB, 487 views)
File Type: jpg Desktop TL 2.jpg (893.0 KB, 468 views)
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Old 10th January 2013, 05:50 AM   #1055
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Quote:
Originally Posted by xrk971 View Post
The latest build pics on the FH3 vs DTB appears to be using real thick wool felt. Where do you get that stuff?
Somewhere in SE England.

dave
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Old 10th January 2013, 06:03 AM   #1056
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Quote:
Originally Posted by xrk971 View Post
Ok, where is a good place to get inexpensive wool felt then? Is there something magical about wool vs synthetic fibers for damping?
inexpensive wool felt is an oxymoron!
Maybe it's the most expensive thing related to audio...
To have effectiveness it should be ...well, some of the most famous
enclosures adopt it ,mostly on the baffle.
Of course, using it to attenuate the back wave of the membrane
in a twisted environment brings results that cotton and synthetic fibre
don't show; it's related to the density/volume and the properties of wool
to convert pressure to heat.
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Old 10th January 2013, 07:20 AM   #1057
xrk971 is online now xrk971  United States
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Quote:
Originally Posted by chazdrumzalot View Post
For your viewing pleasure: Henkjan's desktop TL in foam board.

Compared to my cornus, these are much more quick-and-dirty, however I am much more pleased with the result. I'll definitely be making a real pair as soon as I am able.
Nice work Chaz! Glad it worked out for you, congratulations.
This is exactly what is so great about foam core speakers: you were able to determine that a design is worthy of pursuing in real wood quickly and cheaply. And it probably sounds pretty good even if you left it in foam?

What is it about the sound from this vs your cornu's that you like better in sound quality?
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Old 10th January 2013, 07:24 AM   #1058
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Quote:
Originally Posted by planet10 View Post
Somewhere in SE England.

dave
LOL. You might as well have said New Zealand, known for its wool. The only time I have seen something like this in the States is sold as footbed liners for foul weather / fisherman boots.
I just saw a post under
Henkjan's TL thread where someone said they used a $1 polyester fleece blanket from dollar store as stuffing with good success.
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Old 10th January 2013, 11:38 AM   #1059
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Quote:
Originally Posted by chazdrumzalot View Post
For your viewing pleasure: Henkjan's desktop TL in foam board.

Compared to my cornus, these are much more quick-and-dirty, however I am much more pleased with the result. I'll definitely be making a real pair as soon as I am able.
Is there much foam core "sound"? Honky, rattles or resonances? If your foam core looked better, would you use it?

Thanks!
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Old 10th January 2013, 01:16 PM   #1060
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For the Cornu and FH3-inspired horn (and all of my other foam core speakers), I do not hear any rattles or resonances of the foam cabinet itself. However, you can feel that the foam core is vibrating and thus, there is probably some low level acoustic output - but it doesn't seem to detract from the overall sound. Use of bracing is important, for the Cornu, the spirals act as bracing for the baffle. For other box shaped designs, I add bracing wherever the span feels like it is more than 3 inches. This helps keep the structure more stable and prevents it from resonating too much or collapsing if you push on the wall too hard.
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