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Old 5th January 2013, 11:09 PM   #1
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Default Ten inch down to 23hz F3????

The weird Dayton 10 inch that has that big Aluminium phase plug..
Noting the low Fr in the Twenties, I modeled a big box for an F3 of 23.35 Hz. At 4.6 Cu. feet it will be substantial.....but 23.35, I'll take it.

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Old 6th January 2013, 12:20 AM   #2
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It's not a huge box, but not small either.

You might want to also consider reading Bob Cordell's approach, called the EBS.
He argues that it works out better. I am not sure. But it is worth consideration.

It can be achieved through a variety of means, although I think he uses straight up EQ.

The other thing is that there may be 12" and 15" drivers with similar F3 and low VAS that have higher max output and maybe lower distortion. Price could come into play there. The Dayton line is pretty darn good for sure.


Oh, btw, drivers with phase plugs "leak" which means that they have losses that effect the tuning and especially if the design requires a sealed enclosure.
http://www.bearlabs.com -- Btw, I don't actually know anything, FYI -- [...2SJ74 Toshiba bogus asian parts - beware! ]
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Old 6th January 2013, 12:24 AM   #3
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For 10" driver? DAYTON RS270S-8
and VB = 133.0 L, FB = 20.7 Hz
(4.6 cubic foot = 130.25liter)
F3 = 30 Hz
Maybe you have different driver or somewhat awkward alignment?!
Edit: Do you mean sealed?
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Old 6th January 2013, 01:30 AM   #4
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Yes it is the vented type.........I'm going with Ray Aldens formulas.
The EBP splits right down the line for sealed vs. vented @ 47.88461538
Yes a formula... Ray seems to expect there will be mis-alignments (Air leaks) however small.

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