18" horn enclosure

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I want to try my hand at horn resp. Still struggling with the rear enclosure volume and also, where exactly does S1 begin?
For selenium 18sw2p.
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I can post dimensions if anyone is willing to assist.
 
Selenium 18sw2p
THIELE-SMALL PARAMETERS
Fs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36 Hz
Vas. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179 (6.32) l (ft3)
Qts. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.42
Qes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.43
Qms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16.12
ho (half space) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.56 %
Sd. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.1194 (185.07) m2 (in2)
Vd (Sd x Xmax) . . . . . . . . . . . . . . . . . . . . . . . . . . . 776.1 (47.36) cm3 (in3)
Xmax (max. excursion (peak) with 10% distortion) . . . 6.5 (0.26) mm (in)
Xlim (max.excursion (peak) before physical damage)21.0 (0.83) mm (in)
Atmospheric conditions at TS parameter measurements:
Temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24 (75) °C (°F)
Atmospheric pressure . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1,022 mb
Humidity. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45 %
Thiele-Small parameters are measured after a 2-hour power test using half AES power .
A variation of ± 15% is allowed.
ADDITIONAL PARAMETERS
bL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25.4 Tm
Flux density . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.75 T
Voice coil diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 (4) mm (in)
Voice coil winding length . . . . . . . . . . . . . . . . . . . . 50.5 (165.7) m (ft)
Wire temperature coefficient of resistance (a25). . . . . 0.00380 1/°C
Maximum voice coil operating temperature. . . . . . . . 275 (527) °C (°F)
qvc (max.voice coil operating temp./max.power) . . 0.46 (0.88) °C/W(°F/W)
Hvc (voice coil winding depth) . . . . . . . . . . . . . . . . . 22.0 (0.87) mm (in)
Hag (air gap height). . . . . . . . . . . . . . . . . . . . . . . . . . . 9.0 (0.35) mm (in)
Re . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5.6 W
Mms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217.7 (0.480) g (lb)
Cms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89.8 mm/N
Rms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1 kg/s
NON-LINEAR PARAMETERS
Le @ Fs (voice coil inductance @ Fs). . . . . . . . . . . . . . . 11.069 mH
Le @ 1 kHz (voice coil inductance @ 1 kHz) . . . . . . . . . . 4.256 mH
Le @ 20 kHz (voice coil inductance @ 20 kHz) . . . . . . . . 1.797 mH
Red @ Fs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0 .43 W
Red @ 1 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11.75 W
Red @ 20 kHz . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230.22 W
Krm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.985 W
Kxm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52.746 mH
Erm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.993
Exm. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.712
Power handling specifications refer to normal speech and/or music program material,
reproduced by an amplifier producing no more than 5% distortion. Power is calculated as
true RMS voltage squared divided by the nominal impedance of the loudspeaker.
ADDITIONAL INFORMATION
Magnet material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Barium ferrite
Magnet weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3,440 (120) g (oz)
Magnet diameter x depth. . . . . . . . . . . . . . 220 x 24 (8.66 x 0.95) mm (in)
Magnetic assembly weight . . . . . . . . . . . . . . . . . . . 8,600 (18.96) g (lb)
Frame material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Aluminum
Frame finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Black epoxy
Magnetic assembly steel finish . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Tin plated
Voice coil material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Copper
Voice coil former material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Fiberglass
Cone material . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Non pressed long fiber pulp
Volume displaced by woofer . . . . . . . . . . . . . . . . . . . . 8.6 (0.304) l (ft3)
Net weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10,500 (23.15) g (lb)
Gross weight. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11,720 (25.84) g (lb)
Carton dimensions (W x D x H). . . . . . 48 x 48 x 24 (18.9 x 18.9 x 9.5) cm (in)
MOUNTING INFORMATION
Number of bolt-holes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Bolt-hole diameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 .0 (0.32) mm (in)
Bolt-circle diameter. . . . . . . . . . . . . . . . . . . . . . . . . . . 438 (17.24) mm (in)
Baffle cutout diameter (front mount) . . . . . . . . . . . . . 422 (16.61) mm (in)
Baffle cutout diameter (rear mount). . . . . . . . . . . . . . 412 (16.22) mm (in)
Connectors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Silver-plated push terminals
Polarity. . . . . . . . . . . . . . . . . . . . . . . . . . . Positive voltage applied to the positive
terminal (red) gives forward cone motion
Minimum clearance between the back of the magnetic assembly and the
enclosure wall . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75 (3) mm (in)
 
Usually the cabinet external volume is about 1.2 - 1.35 times the volume simmed by Hornresp. I calculated the external volume as ~435 liter, therefore I would limit simulated volume to ~344 liter or less. On my own designs I calculate the panel volume and substract that from the external volume, as well as the driver, handles, etc.

It will go ~10 Hz lower then Cubo 18, at the same sensitvty. it will have ~40% higher excursion needs between 40 -60 Hz, significantly less below 40 Hz untill equal at about 25 Hz.

Cubo 18 is ~250 liter external, Cubo Sub is ~368 liter external.

Best regards Johan
 
"It will have ~40% higher excursion needs between 40 -60 Hz, significantly less below 40 Hz until equal at about 25 Hz."-What does this mean in terms of efficiency as an outdoor cab for dj and p.a since the 40 -60 Hz range is also much needed ?

The difference between the 2 dual 18" bins and 4 of these single 18" bins @ 1000 w per driver.
 

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Here it it is
General Specifications

  • Nominal Diameter: 460 / 18 mm/inch
  • Rated Impedance: 8 Ω
  • Program Power: 2000 W AES
  • Power handling capacity: 1000 W AES
  • Sensitivity: 97 dB
  • Frequency Range: 35 Hz ÷ 1000 Hz
  • Effective Piston Diameter: 380 / 15 mm/inch
  • Max Excursion Before Damage (peak to peak): 40 / 1.6 mm/inch
  • Minimum Impedance: 6.0 Ω
  • Voice Coil Diameter: 100 / 4 mm/inch
  • Voice Coil Material: Copper
  • Voice Coil Winding Depth: 23 / 0.9 mm/inch
  • Number of layers: inside / outside
  • Kind of layer: 2
  • Top Plate Thickness: 15 / 0.6 mm/inch
  • Cone Material: No pressed pulp
  • Cone Design: Curved
  • Surround Material: Polycotton
  • Surround Design: M - roll


Thiele/Small Parameters

  • Resonance frequency: 33 Hz
  • DC resistance: 5.0Ω
  • Mechanical factor: 8.3
  • Electrical factor: 0.34
  • Total factor: 0.33
  • BL Factor: 23.5 T · m
  • Effective Moving Mass: 180 g
  • Equivalent Cas air load: 226 liters
  • Effettive piston area: 0.113
  • Max. linear excursion (mathematical): 7.8 mm
  • Voice - coil inductance @ 1kHz: 1.9 mH
  • Half-space efficiency: 2.30%


Mounting information

  • Overall Diameter: 470 / 18.5 mm/inch
  • Bolt Circle Diameter: 438 / 17.2 mm/inch
  • Bolt Hole Diameter: 8 / 0.3 mm/inch
  • Front Mount Baffle Cut-out: 416 / 16.4 mm/inch
  • Rear Mount Baffle Cut-out: 416 / 16.4 mm/inch
  • Depth: 209 / mm/inch
  • Volume occupied by the driver: 6.5 / 0.23 liters/ft³
  • Net Weight: 14 / 31.1 kg/lbs


Shipping information

  • Shipping weight: 14.8 / 32.9 kg/lbs
 
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