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Old 28th May 2010, 04:46 AM   #1
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Default Odd but simple subwoofer

Some years ago, I ran across an Internet article about a subwoofer that consisted of a square tube about a foot on a side and four feet long. Mounted at the halfway point (inside, of course) was a 10" woofer. Essentially it was a 4'X4' open baffle rolled up. What apparently made it work was its intended location, which was at the juncture of floor and wall, which gives considerable bass boost. I don't remember if there was any equalization involved. I think there was some connection to the Linkwitz site, but I'm not sure. Anyway, does that ring a bell with anyone?
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Old 28th May 2010, 12:26 PM   #2
bjorno is offline bjorno  Sweden
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Quote:
Originally Posted by skootsi View Post
Some years ago, I ran across an Internet article about a subwoofer that consisted of a square tube about a foot on a side and four feet long. Mounted at the halfway point (inside, of course) was a 10" woofer. Essentially it was a 4'X4' open baffle rolled up. What apparently made it work was its intended location, which was at the juncture of floor and wall, which gives considerable bass boost. I don't remember if there was any equalization involved. I think there was some connection to the Linkwitz site, but I'm not sure. Anyway, does that ring a bell with anyone?
Hi skootsi,

See the picture of what happens if you place the H-Frame at the juncture of floor and rear wall, which gives considerable bass attenuation compared to a side wall that are boosting the level only moderately,IMO still a mid-bass.


b
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File Type: gif 48in_H-Frame.GIF (58.2 KB, 252 views)
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Old 28th May 2010, 04:50 PM   #3
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Bjorno...

Thanks immensely. Of course I had forgotten all the terminology, so I couldn't search effectively. Your attachment gives me things to study, as well as what I need to find other references. I already know a lot more than I did (couldn't know less).

Is there a reason why the vast majority of subwoofers are sealed or vented boxes, rather than U frame or H frame dipole types? Power handling/SPL? Neither is a consideration in my case, as I can't play music too loudly. I just want efficient, solid (boom-free) bass extension from a package I can build myself for a reasonable amount.
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Old 28th May 2010, 07:48 PM   #4
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Simplicity & costs. Anybody can build a 6 board sealed box. However, add a 7th board & you can have a tapped horn that can out perform a sealed, vented, BP1, BP2, FLH, & RLH of the same size.
http://www.avsforum.com/avs-vb/showthread.php?t=1212465
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Evolution of the Tapped Horn
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Last edited by BP1Fanatic; 28th May 2010 at 07:54 PM.
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