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Old 7th December 2005, 03:06 PM   #1
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Default My latest concept

Hello, longtime enthusiast, first time posting. I came up with the idea of a baffless, and time aligned speaker some time ago after studying Dr. D'Appolito's white paper on geometric design. I followed all of his criteria, including 3rd order crossovers @ ~ 1500 Hz (I know that he has since used 4th order). Amazing what can be had (in terms of value) at such low cost. I used the Dayton Euro drivers, and are amazed with their value. I would put these up against the Vince Christian design anyday. They do require a subwoofer crossed at roughly 90Hz in a larger room (such as mine), but are sufficient in the bass region in a 1/8th space environment.

Benefits would be the peerless (pun to be revealed later on) reproduction of recorded effects, detail, and imaging. I've never heard another speaker reproduce so much of what the recording has on it.

Detractors would be a forward midrange, but if seated more than 10 ft. away this isn't so much a problem (a larger inductor used with the woofers woulda helped). Stupid me sealed the crossover section in the tweeter tube (rookie mistake). Sometimes, these speakers are too revealing on poorer recordings such as anything produced by a rap recording label (except by Aftermath).

Please tell me what you think. I give you the Dayton Sound Tubes!

Here's a pic: http://i10.photobucket.com/albums/a1...d/DSC00071.jpg
and another :
http://i10.photobucket.com/albums/a1...d/DSC00070.jpg
-Thanks
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Old 7th December 2005, 03:37 PM   #2
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Interesting stuff and welcome to the forums.
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Old 7th December 2005, 04:03 PM   #3
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I'm a firm believer in baffle-less design as well, it does seem to increase detail and imaging. Nice project, once you get bitten by the DIY bug there is no turning back.

A few of my baffle-less designs

Center Channel
http://kingdaddy.linaeum.com/Center%20Channel/

Mains
http://kingdaddy.linaeum.com/Mains%20(SST-8)/

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Old 7th December 2005, 04:46 PM   #4
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Excellent work
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Old 7th December 2005, 06:09 PM   #5
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Excellent for a first project - quite an undertaking to build enclosures like that.

Please tell us more about the build - what materials did you use to make the cylinders, etc?
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Old 8th December 2005, 12:57 AM   #6
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Thanks all for the positve responses. Now, if I only had the woodworking skills of Kingdaddy (wow man)! They're constructed of 6" PVC with pine blocks for the spacers. The PVC was lined with a layer of spray asphalt (makes cats sick), and stuffed with polyfill. The caps are 3/4 MDF.
I would say that the enclosure is now more of an aperiodic membrane type in that they were tuned for a combined F3 of 50Hz, but the tubes still seemed to resonate in the midrange, thus the stuffing. I have to thank Darren Kuzma at Parts Express as I was inspired by his use of PVC on his line arrays (my next project).
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Old 8th December 2005, 03:24 AM   #7
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Default Re: My latest concept

Quote:
Originally posted by []0[][]v[][]0
Please tell me what you think. I give you the Dayton Sound Tubes!
Sexy!

I would have those in my living room, nice work!
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Old 8th December 2005, 03:32 PM   #8
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Quote:
Originally posted by []0[][]v[][]0
The PVC was lined with a layer of spray asphalt (makes cats sick), and stuffed with polyfill.
Very interesting, I choose a very similar dampener called “Leak Stopper” which is a tar slurry. It works very well and deadens the enclosures very well.

Good luck and congrats on your project

Leak Stopper (great stuff if you have a few days to let it dry)
http://www.apoc.com/Gardner-5-02/ga-leakstopper.htm
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Old 8th December 2005, 03:53 PM   #9
adason is offline adason  United States
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one has to be carefull about diffraction with shape like that
it helps to smooth the edges and putting the speaker off center
http://www.trueaudio.com/st_diff1.htm
ed
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Old 8th December 2005, 05:37 PM   #10
kneadle is offline kneadle  United States
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Quote:
Originally posted by adason
one has to be carefull about diffraction with shape like that
it helps to smooth the edges and putting the speaker off center
http://www.trueaudio.com/st_diff1.htm
ed
I hear this quite frequently (and read it, too ), but when I built my KatKit speakers, I couldn't hear diffraction problems, nor could I hear baffle-step loss.

Please let me make it clear that I believe the science of both, and my baffle-less projects are built knowing that they are compromise projects with respect to diffraction and baffle-step loss, but the results--the results are just phenomenal even as compromises.

Respectfully,
Dave
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