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| Date: |
July 02, 2008 at 19:48:29 |
| From: |
norman bates, [oproxy.rockwellcollins.com] |
| Subject: |
1.3ft3 sealed, f3 = 31 hz |
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http://www.tymphany.com/datasheet/printview.php?id=106
T-S Parameters
Resonance Frequency
fs=20.5Hz
Qts = 0.47
Vas 45.6 ltrs (1.61ft3)
spl 82@2.83v (eeeeewwwwwwww)
qtc .707
VB = 1.27 Ft3
fsb = 30.84 hz
F3 = 30.84 hz
I wouldn't bother with ported or passive radiator as ideal tuning is near 17hz.
With that little cone area and low spls rating, you will run into excursion trouble 30-40hz..........
and I doubt you'd geat more than 100db out of it (power compression) regardless of power rating or excursion.
However I do like the sealed design.
qtc .707 with f3 of 31 is great for a sealed box, and it has some excursion protection too boot........
Too bad it is so insensitive..........
Sealed equations
Vb = Vas / [(Qtc/Qts)^2-1]
Fsb = (Qtc x Fs) / Qts
F3 = Fsb if qtc .707
Ported equations
Vb = qts^2.87 x 15 x Vas
F3 = qts^ -1.4 x .26 x fs
Fb (tuning) = qts^ -.9 x 0.42 x fs
A = 1.463 x 10^7 x R^2
B = Fb^2 x Vb (volume in cube inches)
Lv = (A / B) - 1.463 x R
R = radius of port
Norman
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