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In Reply to: RE: PPSL and Synergy posted by JoshK on February 16, 2012 at 18:36:40
An inexpensive option might be the Eminence 15269 (Martin 1844). About 101dB/2.83V/1M (two drivers).Driver Properties
Name: 15269
Type: Standard one-way driver
Company: Eminence Speaker LLC
Comment: Martin #1844
No. of Drivers = 2
Mounting = Standard
Wiring = Parallel
Fs = 23.4 Hz
Qms = 11.63
Vas = 359.4 liters
Cms = 0.35 mm/N
Mms = 132.1 g
Rms = 1.67 kg/s
Xmax = 9.1 mm
Xmech = 15 mm
P-Dia = 329 mm
Sd = 850 sq.cm
P-Vd = 0.774 liters
Qes = 0.35
Re = 6.21 ohms
Le = 2.5 mH
Z = 8 ohms
BL = 18.56 Tm
Pe = 300 watts
Qts = 0.34
no = 1.269 %
1-W SPL = 93.18 dB
2.83-V SPL = 94.28 dB
-----------------------------------------
Box Properties
Name:
Type: Closed Box
Shape: Prism, square (optimum)
Vb = 11.19 cu.ft
Qtc = 0.5
QL = 14.54
F3 = 57.9 Hz
Fill = heavy
********************************************
This would have a Qtc=0.5 and a 40hz resonance. With a 12dB/oct high-pass with a Q=1 at 40hz this would have a LR24 transfer function at 40hz.
*************************************************
Same drivers in 7 cu ft would have a Qtc=0.577 and a 47hz resonance. With a 47hz Q=0.867 12dB high-pass the transfer function would be LR24 at 47hz.
**************************************
Same drivers in 4 cu ft would have a Qtc=0.707 and a 60hz resonance. With a 60hz Q=0.707 12dB high-pass the transfer function would be LR24 at 60hz.
Edits: 02/17/12Follow Ups:
This one looks good too. The low Qes, FS with high Vas combo usualy has a nice snappy sound at lower power. Like the old Klipsch Cornwalls if that's what you like. The high LE limits it to below 400hz where the Unity would have to take over. Impressive output to 55hz down tune and EQ for lower.
Others to look at are the Dayton Classic subwoofer with the big rolled surround low bass but only 95db for two. For smaller boxes Faital 12PR300, The FAital has low Le for nicer midbass usage.
I notice this is a Martin Sound driver. Then I noticed that they sell a JBL2226 replacement called the M-2226. Do you happen to have any experience with this driver? Very little info is provided.
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"When Khruschev said "we will bury you" I don't think he meant with surplus parts." zacster
Should have changed the subject to M-2226. Have you experienced these?
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"When Khruschev said "we will bury you" I don't think he meant with surplus parts." zacster
No, I haven't, but I know others that have used them.
A JBL 2226 clone they are not.
How would they work for hi-fi?
Not very well would be my guess. They are very stiff and have a very low Vas. I doubt they would have very good low-level detail. Run a sim and see how well they would work in a sealed box, I think you will not like what you find there either.
Thanks!
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"When Khruschev said "we will bury you" I don't think he meant with surplus parts." zacster
Thanks! I appreciate the example.
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"When Khruschev said "we will bury you" I don't think he meant with surplus parts." zacster
Try to buy the best components that u can afford and built something really big. Bigger the better. And then spend your remaining life time to tune it. :) Life is short and your pair of ear's life is even shorter. :)
I am of the same opinion, but at least I have an example to study and understand. Then I can play with whatever "upgraded" driver I'd prefer.
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"When Khruschev said "we will bury you" I don't think he meant with surplus parts." zacster
These might be what you want.
The advantage of these drivers is the midbass up to the horn. If a lower vrossocer or PPSL is the goal a cheaper drvier is just as good. Save these for a conventional two way to a 1.4" horn at 1Khz.
Scott
That was kind of my thought as well, but suggestions were wanted for a better driver.
I am fond of Eminence, and know how the sound dramatically improves in a PPSL configuration, so I tend to recommend inexpensive drivers.
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