| Content | OMEGA PRO-18A Professional Series
Recommended for professional audio as a woofer in vented enclosures. Also ideal for horn loading and scoops.
Product type
Loudspeaker Chassis
Nominal Diameter
457.2 mm
Overall diameter
457.2 mm
Pitch Circle Diameter
438.2 mm
Cut- out Measurement
420.5 mm
Diameter of fixing holes
7.1 mm
Nominal Impedance
8 Ohm(s)
Nominal Load Capacity
800 W
maximum rated load
1600 W
Sensitivity (1 W / 1 m)
97 dB
Frequency response
40 - 800 Hz
Voice Coil Material
copper
Depth of the magnetic gap
9.53 mm
Thiele & Small Parameter
Fs (Resonance Frequency)
25 Hz
Re (DC resistance)
5.2 Ohm(s)
Qms (mechanical quality)
8.18
Le (inductance of the voice coil)
1.67 mH
Qes (electrical quality)
0.32
Qts (overall quality)
0.31
Vas (equivalent volume)
548.7
BL (power factor)
18.8 T/m
Xmax (maximum displacement)
4.8 mm
Cms (elasticity of the suspension)
0.29 mm/N
Sd (membrane area)
1159 cm²
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- Shape Cylindrical
- Product type Cone driver
- Brand Sica
- Frequency coverage type Sub
- Dimensional category 18 inch
- Front chape Cylindrical
- Magnet type Ferrite
- Basket masterial Aluminium
- Nominal impedance 4 ohm
- Nominal power handling 700 W
- Max power handling 1400 W
- Sensitivity 97.9 dB
- Voice coil diameter 4 inch
- Flux density 1.12 T
- External diametre 462 mm
- Mounting diametre 415 mm
- Depth 203.5 mm
- Depth after front 188.5 mm
- Front thickness 15 mm
- Diamètre aimant (mm) 220 mm
- Weight 13.9 kg
- Fs 36.9 Hz
- Re 3.25 ohm
- Qes 0.29
- Qms 9.03
- Qts 0.28
- Vas 181.9 L
- Sd 1164.2 cm²
- Cms 95 µm/N
- Efficiency 3.02 %
- Xmax 6 mm
- Mms 196.2 gr
- BL 22.55 T.m
- Le 1.03 mH
- EBP 127
- Dome material Paper
- Cone material Paper
- Surround material Cloth
- Shipping weight 13.9 kg
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Nominal Specifications
Nominal Diameter 18“, 460 mm
Overall Diameter 18.11“, 460 mm
Bolt Circle Diameter 17.32“, 440 mm
Baffle Cutout Diameter 16.6“, 422 mm
Depth 9.09“, 231 mm
Flange and Gasket Thickness 0.55“, 14 mm
Electrical Specifications
Minimum Impedance 7.2 Ohm
Nominal Impedance 8 Ohm
Nominal Power Handling*** 1,600 W
Maximum Power Handling**** 3,200 W
Sensitivity (1W/1m) 98 dB
Frequency Range 30 - 1500 Hz
Voice Coil Diameter 4“, 100 mm
Winding Material Copper
Former Material Glass Fiber
Winding Depth 1.23“, 31.3 mm
Magnetic Gap Depth 0.61“, 15.5 mm
Flux Density 1.05 T
THIELE & SMALL Parameters
Resonant Frequency (fs) 32 Hz
DC Resistance (Re) 5.4 Ohm
BL Product (BL) 26.7 N/A
Diaphragm Mass inc. Airload (Mms) 240 grams
Mechanical Compliance of Suspension (Cms) 0.1 mm/N
Rms 5.27 Kg/s
Electromagnetic Q (Qes) 0.37
Mechanical Q (Qms) 9.3
Total Q (Qts) 0.36
Compliance Equivalent Volume (Vas) 6.9 ft³, 195.5 dm³
Surface Area of Cone (Sd) 182“², 1,174 cm²
Maximum Linear Excursion (Xmax)* 13 mm
Xdamage** 28 mm
Coil Inductance (Le) 1.45 mH
Diaphragm mass (Mmd) 217 g
Eta Zero 1.76 %
Notes
*Xmax = [(winding depth - magnetic gap depth) / 2] + (magnetic gap depth / 3)
**Maximum excursion before permanent damage
***2 Hours Test According to AES 2-1984 Rev. 2003
****Maximum power is defined as 3dB greater than nominal power
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- 4'' sandwich voice coil fiberglass former
- Double progressive wave Konex spider
- Cloth suround with DAR technology
- Autoclave waterproof cone treatment
- Balanced neodymium magnet circuit
- Cooling radiator and ventilated voice
- coil to reduce power compression
- 98.1 dB sensitivity
Manual/Εγχειρίδιο
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Shape Cylindrical
Product type Cone driver
Brand Sica
Frequency coverage type Sub, Low
Dimensional category 18 inch
Front chape Cylindrical
External diametre 462 mm
Mounting diametre 415 mm
Magnet type Neodymium
Basket masterial Aluminium
Nominal impedance 8 ohm
Nominal power handling 1200 W
Max power handling 2400 W
Manufacturer sensitivity 97.3 dB
Calculated sensitivity 95 dB
Frequency response 35-700 Hz
Voice coil diameter 4 inch
Winding material Copper
Voice coil former Glass fiber
Winding depth 27 mm
Gap height 12 mm
Flux density 1.21 T
Depth 211 mm
Depth after front 196 mm
Front thickness 15 mm
Diamètre aimant (mm) 135 mm
Weight 7.2 kg
Fs 36.2 Hz
Re 5.2 ohm
Qes 0.42
Qms 6.56
Qts 0.39
Vas 189 L
Sd 1164.2 cm²
Cms 98 µm/N
Efficiency 2.07 %
Calculated efficiency 2.05 %
Xmax 8 mm
Xvar 10.1 mm
Mms 197 gr
BL 23.54 T.m
Le 1.35 mH
EBP 86
Dome material Paper
Cone material Paper
Surround material Cloth
Surround shape Double roll
Shipping weight 9 kg
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Nominal Specifications
Nominal Diameter 18“, 460 mm
Overall Diameter 18.11“, 460 mm
Bolt Circle Diameter 17.32“, 440 mm
Baffle Cutout Diameter 16.61“, 422 mm
Depth 7.65“, 194.3 mm
Flange and Gasket Thickness 0.55“, 13.9 mm
Electrical Specifications
Minimum Impedance 6.3 Ohm
Nominal Impedance 8 Ohm
Nominal Power Handling*** 1200 W
Maximum Power Handling**** 2400 W
Sensitivity (1W/1m) 98 dB
Frequency Range 35 - 1600 Hz
Voice Coil Diameter 4“, 100 mm
Winding Material Kupfer
Former Material Glass Fiber
Winding Depth 1.14“, 28.9 mm
Magnetic Gap Depth 0.47“, 12 mm
Flux Density 1.22 T
THIELE & SMALL Parameters
Resonant Frequency (fs) 35 Hz
DC Resistance (Re) 5 Ohm
BL Product (BL) 24.8 N/A
Diaphragm Mass inc. Airload (Mms) 211.8 grams
Mechanical Compliance of Suspension (Cms) 0.098 mm/N
Rms 4.19 Kg/s
Electromagnetic Q (Qes) 0.38
Mechanical Q (Qms) 11.1
Total Q (Qts) 0.37
Compliance Equivalent Volume (Vas) 6.74 ft³, 190.8 dm³
Surface Area of Cone (Sd) 181.97“², 1174 cm²
Maximum Linear Excursion (Xmax)* 12.45 mm
Xdamage** 21 mm
Coil Inductance (Le) 1.26 mH
Diaphragm mass (Mmd) 189.1 g
Eta Zero 2.1 %
Notes
*Xmax = [(winding depth - magnetic gap depth) / 2] + (magnetic gap depth / 3)
**Maximum excursion before permanent damage
***2 Hours Test According to AES 2-1984 Rev. 2003
****Maximum power is defined as 3dB greater than nominal power
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