New HT subwoofer. Dayton Ref 18" - Page 5 - diyAudio
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Old 3rd November 2012, 04:21 PM   #41
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Awesome info josh! Thanks always helpful!

So how do you like the driver? Or you haven't used it yet, only ran tests?
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Old 3rd November 2012, 09:00 PM   #42
Djim is offline Djim  Netherlands
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Hi guys,

On the manufacturer page you can find a helpful drawing. In that drawing the top plate is 10mm and the distance to the backplate is 50mm. With the given Xmax of 12.75 mm this suggests a VC height of 35.5mm. From there you can calculate the Xlim:
50mm (backplate distance) minus 17.75mm (1/2 VC height) = 32.25mm (one way).

Xlim = 32.25 mm

About the Xvar, you would have to measure it. You can make a theoretical indication about its physical capabilities but that doesn't say anything about its linear behaviour.
But at the best this driver could have a usable excursion of about: (Hvc – Hg) / 2 + 1/2Hg = 17.75 mm. But with a Cms of only 0.15 mm/N, a Mms of 429.9 gram and a BL of 20.4 Tm that looks a little optimistic.

Click the image to open in full size.

(edit: with usable excursion I mean excursion that transfers into real dB's)

Last edited by Djim; 3rd November 2012 at 09:08 PM.
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Old 3rd November 2012, 09:27 PM   #43
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Well that's pretty close to Josh's findings...he said about 20mm or so. I'm sure josh will chime in with more info on distortion etc once he plays around with it more.
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Old 3rd November 2012, 09:30 PM   #44
Djim is offline Djim  Netherlands
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Jep, that is in line with Josh his findings. Must say it's a heck of a Home Theatre driver for just 250$. Hopefully it will find its way to Europe soon.
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Old 3rd November 2012, 09:33 PM   #45
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Happen to run any sims on this horn loaded? The cone sure seems stiff enough, but I'm not so sure the motor is strong enough to push this with a decent amount of compression...
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Old 3rd November 2012, 09:36 PM   #46
Djim is offline Djim  Netherlands
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No not yet. For Tapped Horns or PA subs I wouldn't use it since the suspension is too weak like its motor as you mentioned, but for home use I think it's a monster.
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Old 3rd November 2012, 09:37 PM   #47
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Well I guess I'll see how I like it sealed with some EQ, and if necessary for a larger room I can just build multiples!
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Old 3rd November 2012, 09:40 PM   #48
Djim is offline Djim  Netherlands
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Used in sealed enclosures it wouldn't suprise me you would actually have usable 17 mm excursion since the air-spring (acoustic suspension) would help a lot for this driver.
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Old 3rd November 2012, 09:44 PM   #49
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Awesome! It should be finished by next week.
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Old 3rd November 2012, 09:48 PM   #50
Djim is offline Djim  Netherlands
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"finished by next week"... maybe that also counts for your house...;
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