.........it just won't get below 40 hz without going too big
this high Qts makes it a dipole/OB driver
and I suspect it might result in pretty good and detailed bass
but maybe not the kind of bass you expected
Fs = 29 Hz
Qms = 3.99
Vas = 328 liters
Cms = 0.0799 mm/N
Mms = 376.9 g
Rms = 17.21 kg/s
Xmax = 8 mm
Xmech = 12 mm
P-Dia = 465.2 mm
Sd = 1700 sq.cm
P-Vd = 1.36 liters
Qes = 0.86
Re = 8.25 ohms
Le = 2.6 mH
Z = 9 ohms
BL = 25.67 Tm
Pe = 600 watts
Qts = 0.708
no = 0.897 %
1-W SPL = 91.67 dB
2.83-V SPL = 91.54 dB
-----------------------------------------
Box Properties
Name:
Type: Bandpass Single-Tuned Box
Shape: Prism, Bandpass
with two chambers
Chamber 1 - lower-freq.
Vb = 3.473 cu.ft
Fb = 59.48 Hz
QL = 5
F3 = 39.21 Hz
Fill = normal
Chamber 2 - upper-freq.
Vb = 6 cu.ft
Fb = 60 Hz
F3 = 92.47 Hz
Fill = minimal
No. of Vents = 1
Vent shape = round
Vent ends = two flush
Dv = 12 in
Lv = 0.733 in
************************************
97.5dB/W/1M at 50hz, -3dB 39hz~92.5hz, a plain 12" hole for the port (no duct), will handle over 600W with less than 8mm excursion, gross size about 27" cube, or maybe 24x24x35 (external).
Qms = 3.99
Vas = 328 liters
Cms = 0.0799 mm/N
Mms = 376.9 g
Rms = 17.21 kg/s
Xmax = 8 mm
Xmech = 12 mm
P-Dia = 465.2 mm
Sd = 1700 sq.cm
P-Vd = 1.36 liters
Qes = 0.86
Re = 8.25 ohms
Le = 2.6 mH
Z = 9 ohms
BL = 25.67 Tm
Pe = 600 watts
Qts = 0.708
no = 0.897 %
1-W SPL = 91.67 dB
2.83-V SPL = 91.54 dB
-----------------------------------------
Box Properties
Name:
Type: Bandpass Single-Tuned Box
Shape: Prism, Bandpass
with two chambers
Chamber 1 - lower-freq.
Vb = 3.473 cu.ft
Fb = 59.48 Hz
QL = 5
F3 = 39.21 Hz
Fill = normal
Chamber 2 - upper-freq.
Vb = 6 cu.ft
Fb = 60 Hz
F3 = 92.47 Hz
Fill = minimal
No. of Vents = 1
Vent shape = round
Vent ends = two flush
Dv = 12 in
Lv = 0.733 in
************************************
97.5dB/W/1M at 50hz, -3dB 39hz~92.5hz, a plain 12" hole for the port (no duct), will handle over 600W with less than 8mm excursion, gross size about 27" cube, or maybe 24x24x35 (external).
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Hey DJK I ran those box sizes and port dimensions through both hornresp and winISD and didn't get the response you indicated? There is a big peak near 100 hz and the f3 ends up around 45hz. Is there something I missed ?
So did I. How about this?
Grey is a single speaker.
I own 2 of these subs for my mobile disco running from an EP4000 amp and they have NEVER let me down even at full pelt! I mainly use them at home for my home cinema and are known by friends as the "Quake Makers"! I took my gear to an outdoor event last year called TadStock and the professional sound crew around the corner operating the main stage with 4 dual 18's got very curious about my subs.. They were amazed! they said even their subs couldn't get down as low as the 21's!
what type of enclosure or your 21-inch subs?
Hi there m: What type of box and size for your 21-inch subs? regards, Michael
I own 2 of these subs for my mobile disco running from an EP4000 amp and they have NEVER let me down even at full pelt! I mainly use them at home for my home cinema and are known by friends as the "Quake Makers"! I took my gear to an outdoor event last year called TadStock and the professional sound crew around the corner operating the main stage with 4 dual 18's got very curious about my subs.. They were amazed! they said even their subs couldn't get down as low as the 21's!
Hi there m: What type of box and size for your 21-inch subs? regards, Michael
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Well. They are ported and tuned to around 30hz.. I basically bought some 18mm mdf and chucked it all together using wood glue and bracing inside. H=27" W=25" D=24" Port length=15". It's still WIP as it needs carpeting and grilles.
An externally hosted image should be here but it was not working when we last tested it.
with the very high qts spec posted by the late and great DJK, I like his idea of a BP4 with large front chamber - somewhere DJK posted a rule for how to figure that out. (wish my memory were better) -whether those T-S apply to other Pyle = ? - I don't think my Madison 21 had quite that high of qts.
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