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University Classic/Dean Horn profile need driver choice help

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Run multiple simulations for various woofers. Most of new woofers don't even come close to University C15W (ehhh my friend some time ago was selling perfect pair of those) nor in FR and especially not for.impulse response. From oldies EVM15L and JBL130 seems decent (but may require back chamber volume corrections).


Only one current woofer so far looks promising for me and it's Peavey 1508-8 HE BWX, not as good as C15W but I have not found anything better (especially for impulse response).


Bacek, what are you using for the C15W parameters, especially for Le? You are getting much greater high frequency extension than I did in post #68, so something is different.


That said, try the GPA 515-8GHP.

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Check my post with simulation. It's at the bottom. It's for coils in series. This configuration seems to simulate better for HF.


Ah; that's the problem. 0.26mH for voice coils in series means 0.13mH per coil, which is outrageously low. I don't know for certain, but as I stated in post #68 I believe that 0.26mH is for coils in parallel, which means coils in series will be 1.04mH.

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  • 2 weeks later...

'been a while since I posted on this forum (horatio, but I could not get past the sign in gatekeeper with that, so I created a second one).


I built a set of the University Classics a few years ago, and got an Eminence woofer that specs out almost the same as a K33E (fs is 38 instead of 26, but other params are quite close).  I was underwhelmed with this.  Bass didn't go low enough, highs, not high enough.


After quite a bit of searching, seems like people like the original University 15" driver, for which there does not seem to be a modern equivalent. 


But, there are posts by those who've used a K33E and an Eminence CB15 in the 'Classic, and were pleased.  I am puzzled by this to no end.  And all the sims everyone posts leave me cool (sorry guys, but, no one's been able to successfully model up the Khorn and tell why the K33E params work in it, either).


Here's what I have done, though: using Keele's bass horn relationships, I computed the throat and chamber volume for the speakerbuilder TS params for the University driver (series VCs), and I got a throat area and Vb that were just about spot on for what the Classic design is, if I presume a 50 Hz Fc on the flare.


Now here's where it gets interesting: running the numbers for the K33E (and my other Eminence that is in these cabs), and even the CB15 shows that the throat area and Vb of the Classic is not too closely matched by those drivers.


But the Kappa Pro 15C (from the Eminence published data sheet) comes in pretty darn close to the throat area (6x13 slot) and Vb (80 liters, give or take, as computed elsewhere on this thread).  So if you believe the equations, the Kappa 15C looks to have the right stuff.  It's just that the T/S parameters roll up another way on their way to hitting the target St and Vb values.  The 15C should have good upper end, too, to deal with the problem of reaching 400 hz.


Anyone compute the actual design flare rate on this animal?


I figure to make this box really work, a good dsp crossover and biamping is the very least needed.  My final Khorn build (which I call the 'Ultra', since I have not heard anything close since) uses a MiniDsp and is biamped with 100W MOSFET bass and a single ended triode of a handful of watts going into Altec 288's mounted to EV HR6040 CD horns.  Uses the Le Clea'ch crossover topology, and the top is time aligned.  Crosses at 300 Hz to avoid the upper end problem of the Khorn.  Images in a way you can't believe for a horn system.  Sweetness does not begin to describe it.  Some day I'll go listen to a 'Jub, and see what that fuss was about.


I figure a similar go on the Classics ought to make these pretty good, too:  I have a pair of EV HR9040's ('great whites') and the EV drivers for these (DH1012) and those are quite spectacular, just enormous in size.  But they sit nicely on top of the Classics (laying long side down, now).


Anyway, looks to be my project this summer: Kappa 15C's and a miniDSP to biamped configuration.




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Anyway, looks to be my project this summer: Kappa 15C's and a miniDSP to biamped configuration.     -H2


I think the Kappa 15C is the best all around driver for improving the bass DEFINITION and, especially mating with mid horns at 400 hz. with it's approx. 4 db greater output there..........it's audible too. It works in a Cornwall, LaScala/Belle, MWMs, and especially my Quarter Pie horns. It's also a real bargain from Part Express when they have a $20 off sale on it with free shipping. No brainer upgrade if you ask me. 

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  • 1 month later...

Try to model this one:


Precision Devices PD.153ER


Fs          40 Hz
Re          5.87 Ω
Qms      8.65
Qes       0.22
Qts        0.21
Le          0.48 mh
L2          3.09 mh
R2         7.17 Ω
Vas       218.76 litres
Mms     74.36 g
Sd         855.3 cm2
Cms     179.67 µm/N
BL         22.44 T/m
Xmax   5.7 mm
Vd         0.473 litres
Pe         400W
Edited by Mariusz_
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  • 1 year later...
  • 1 year later...

I have a 0.7 scale Classic , its made of 5/8" Baltic birch, about 28"x 22.25"x 16.5" and weighs 51lb empty.  Its loaded with an Eminence made 10.  It would have to be made about an inch deeper to accommodate a 12. The back chamber has foam insulation triangles to reduce its volume down to around 1/2 cubic foot.



~7/10 scale Classic built  by Triticum Audio


response up close - mic ~ at mouth "center" - sometime I'll get the floor plane and data further back.


It seems pretty lively.



10 inch Eminence speaker 

05-RE OHMS 4.33 ------ 13-FS HZ 52.22
06-LE MH .74 ------ 14-MMS GMS 25.60
07-QM 2.94 ------- 15-CMS mm/N .3622
08-QE .250 ------ 16-RMS NS/M 2.8583
09-QT .230 ------ 17-VAS LTRS 68.19
10-XMAX MM 3.00 ------ 18-SD SCM 366.10
11-BL TM 11.99 ------ 19-EBP 206.2
12-EFF % 3.70 ------ 20-SPL dB 97.7

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  • 11 months later...

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