Midbass horn

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here's an old in-room graph of a "small" 150Hz tractrix given to me by Bruce Edgar loaded with an Eminence Beta8cx with Eminence CD8 (aluminum diaphragm) compression driver and an Eminence 1K6 ("textbook") crossover - there's no highpass - unfortunately I didn't measure it with a highpass/bandpass on the cone driver to see what could be done nor its performance with a 6.5" Audax as the flat foam surround had started to rot on the latter;

An externally hosted image should be here but it was not working when we last tested it.
 
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Just found this!

MCM Audio Select 12" Woofer with Paper Cone and Cloth Surround - 175W RMS at 8ohm | 55-2952 (552952) | MCM Audio Select

Thiele-Small Parameters:
  • Resonance Frequency Fs: 38 Hz
  • DC Resistance Re: 7.2 ohm
  • Mechanical Q Factor Qms: 2.8
  • Electrical Q Factor Qes: 0.385
  • Total Q Factor Qts: 0.34
  • Equivalent Cas air load Vas: 108.0 liters
  • Coil Inductance Le: 0.923 mH
  • Efficiency Bandwidth Product EBP 98.70
  • Voice Coil Over Hang X-max 3.75mm
Close?

Also:

http://www.mcmelectronics.com/product/MCM-AUDIO-SELECT-55-1220-/55-1220

Specifications::
Power Capacity: 100W/200W RMS/peak
Sensitivity: 98dB (W/M)
Impedance: 8ohm
Re: 6.8ohm
Le: 2.15mH
Frequency response: 26Hz~3KHz
Fs: 26Hz
Qts: 0.30
Qes: 0.34
Qms: 2.33
Vas: 175.88 (liters)
Xmax: 2.25mm
 
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This is my list sofar of suitable 10 inch drivers. In order of 2x Fs/ Qes mass roll off point:
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Beyma 10Mi100/ 712 Hz
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[FONT=Arial, sans-serif]B&C 10MD26/ 610 Hz[/FONT]
[FONT=Arial, sans-serif]B&C 10MD26/ 610 Hz[/FONT]
[FONT=Arial, sans-serif]DAS audio 10B/ 607 Hz [/FONT]
[FONT=Arial, sans-serif]Precison Devices D.107/ 576 Hz[/FONT]
[FONT=Arial, sans-serif]18 Sound 10M600/ 560 Hz
RCF L10/L750YK/ 544 Hz
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[FONT=Arial, sans-serif]Beta Three 10LB075-8M/ 538 Hz
[/FONT][FONT=Arial, sans-serif] Ciare PW 256/ 530 Hz[/FONT]
[FONT=Arial, sans-serif]MAG Audio M1021/ 529 Hz
KAPPA-10A PRO/ 520 Hz
B&C 10PLB76/ 505 Hz
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[FONT=Arial, sans-serif]18 Sound 10MB600/ 504 Hz[/FONT]
[FONT=Arial, sans-serif]B&C 10FW64/ 504 Hz
Sica 10F2.5CP/ 388 Hz
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[FONT=Arial, sans-serif][FONT=Arial, sans-serif]MAG M1040/ 356 Hz
[/FONT] Sica 10E2CS/ 333 Hz
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There is no judgement on actual (measured) Qes, x-max, Rms. Availability or price. Although no driver in this list is above +- 220$ from where my shopping cart is placed.

Some other diameter examples of good or famous horn drivers.
[FONT=Arial, sans-serif]6 inch B&C 6MDN44/ 634 Hz[/FONT]
[FONT=Arial, sans-serif]8 inch B&C 8PE21/ 734 Hz [/FONT]
[FONT=Arial, sans-serif]12 inch EVM 12L/ 449 Hz [/FONT][FONT=Arial, sans-serif]
15 inch Klipsch KE33/ 168 Hz
15 inch EVM 15L/ 344 Hz
15 Inch Vitavox AK 151/ 333 Hz
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Tinitus, i have tought of using two smaller drivers. Would be wonderfull if we could find two suitable 16 Ohm drivers. Especially in a impulse compensation setup. Where the movements of both drivers on the enclosure cancel each other out.

images
 
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