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Old 9th August 2010, 07:57 AM   #11
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Quote:
Originally Posted by voltcontrol
Or just cross it really low. True sub use.

I already dropped my 2 cents here.
Yea, wanted to get some more input. Thanks!
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Old 9th August 2010, 02:21 PM   #12
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The 18" woofer mentioned before would likely go lower than the 12" for the same power input. There's 12dB difference in efficiency. Compare them with the SPL chart on winISD, set the power input to the same. Methinks the 18" would be far better. There's also excursion-related distortion to worry about with relatively small drivers.
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Old 9th August 2010, 09:12 PM   #13
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Fair point Chris, but I was thinking of un-assisted designs. To take advantage of the 18 is going to need EQ.
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Old 10th August 2010, 02:56 AM   #14
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If your interest is music, there's barely any recording with stuff under 30 Hz. Of course, that may be of great interest to you or you thrive on repetition, can't say.

I like sealed boxes. They do a few things I like: provide enough cubes so as not to raise the driver resonance over your chosen set point (please ask the modelers with Windows machines, but I'd guess 5 cu feet is plenty for your driver), give a free boost at that resonant point (no sense making it too low, eh), and protect the driver from unrestrained excursions below that resonant point (go remind the bass-reflex or TH crowd of that virtue).

As far as I know (and I surely wish somebody would correct me, please) there's only one parameter worth thinking about for really low sealed boxes and that is simply the resonant point with Q being aurally insignificant.

Oh yeah, the other parameter might be "spouse approval quotient." But sealed boxes are good that way because there're no terrible constraints on shape. You could use a sewer pipe (as Briggs did).

Good luck.
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Last edited by bentoronto; 10th August 2010 at 02:59 AM.
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Old 10th August 2010, 03:59 AM   #15
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Hi there Ed: Use search on this forum for: sono subs. Many sonosubs threads exist there. As I recall Steve Cassals (spelling?) from St. Louis, built a sonosub from 28-inch tube usng a 21-inch driver. The ported design had two tubes nested, upward firing driver and ports. Also, sono tubes can be modified to conical shape by cutting-out a triangular section and gluing the main tube back together with liquid nails type construction glue to make a folded design. Also there is El-Pipeo, by Nelson Pass and some clones of these on the sono sub threads. Hope you will post your design, construction details and listening evaluations. ...regards, Michael
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Old 10th August 2010, 05:25 AM   #16
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Quote:
As far as I know (and I surely wish somebody would correct me, please) there's only one parameter worth thinking about for really low sealed boxes and that is simply the resonant point with Q being aurally insignificant.
Qtc is fairly important for sealed boxes if thats what you mean? I love the gentle rolloff of sealed boxes+ how easy they are to make and get right.
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Last edited by Top Shelf; 10th August 2010 at 05:27 AM. Reason: addition
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Old 15th August 2010, 02:16 AM   #17
tb46 is offline tb46  United States
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Hi,

Has anyone suggested the Pyle Pro PDW21250 yet? They finally got a manual for it:

http://www.pyleaudio.com/manuals/PDW21250.pdf

Regards,
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Old 15th August 2010, 03:24 AM   #18
freddi is offline freddi  United States
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hi Oliver - it that Pyle meets specs then it could be some fun. Best, Freddy
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Old 15th August 2010, 03:52 AM   #19
a.wayne is offline a.wayne  United States
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Why would it only have a FR cutoff of 45 hz ?
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Old 15th August 2010, 12:14 PM   #20
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That'd be on an infinite baffle, and notice it's the f3. The f10 is usually of more interest.
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