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Old 1st May 2004, 12:54 AM   #1
MtnBob is offline MtnBob  United States
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Default How About These for Dipole Sub?

I saw the Dayton 12" IB at PE. The specs are fs 26.4 Ots .61 Xmax 15.1mm. Those look good for a dipole sub to my untrained eye. If not, got any suggestions in the same price range ($85) ?
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Old 1st May 2004, 02:28 AM   #2
Mats J is offline Mats J  United States
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take a look at this site. He uses that woofer in a u-frame
http://www.geocities.com/kreskovs/NaO.html
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Old 1st May 2004, 02:34 AM   #3
chops is offline chops  United States
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Default Re: How About These for Dipole Sub?

Quote:
Originally posted by MtnBob
I saw the Dayton 12" IB at PE. The specs are fs 26.4 Ots .61 Xmax 15.1mm. Those look good for a dipole sub to my untrained eye. If not, got any suggestions in the same price range ($85) ?
Those look good to me. I was actually thinking about those at one point, but didn't have the cash at the time to afford them.
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Old 1st May 2004, 02:42 AM   #4
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They test on paper pretty well. Although the Pyle Pro PPA 12" or 15" are tested well and much cheaper.

Milo

Look for Thorsten "Ezee" Loesch spreadsheet for open baffle subs.
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Old 1st May 2004, 03:54 AM   #5
MtnBob is offline MtnBob  United States
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Chops, I remember reading about your adventure with an OB sub. You seemed pretty happy with the Pyle 15"ers, as I recall. But didn't you use 4? That, along with another amp, would put me over budget . How do you think just a pair would do?

I was thinking 12s to keep the size and cost lower (and SAF higher) but the Pyle 12s have a higher fs than I was hoping for.

My room is fairly large volume - abt 14x20 with a ceiling sloping from 10' to 20'.

Being retired is great for having time to build, but the limited income makes it difficult to buy anything to build with!
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Old 1st May 2004, 01:21 PM   #6
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Here is the spreadsheet.

http://melhuish.org/audio/download/Xlbaffle.xls

you'll notice with testing that the baffle has much to do with the Frequency response. SPL of course has more to do with the size of the driver. Although I can't imagine that 2x12" woofers can't fill your room properly powered. At the same time though, through all my plug and chug experiments I found that I couldn't really justify using a smaller baffle than the one that CHOPS used, therefore you might just as well go with the 15".

NOTICE: All my work thus far regarding the OB subs is on paper only. That xlbaffle spreadsheet is really great fun

Milo
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Old 1st May 2004, 01:52 PM   #7
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http://www.madisound.com/fw800n.pdf

You wouldn't need a really big baffle for these. And they are sooooo cheep.

Milo
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Old 1st May 2004, 06:30 PM   #8
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IMO, that driver would not be suitable. Its displacement is pretty damn small.
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Old 1st May 2004, 11:01 PM   #9
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the driver is 31.5" in diameter.

A 15" driver with an xmax of 6mm displaces ~167 cubic inches of air in its full stroke

A 31.5" driver with an xmax of 2.3mm displaces ~280 cubic inches of air in its full stroke.

Milo
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Old 1st May 2004, 11:41 PM   #10
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Quote:
Originally posted by 454Casull
IMO, that driver would not be suitable. Its displacement is pretty damn small.
It's a 32" woofer, it doesn't need much xMax to move a lot of air.

dave
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