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SIGMA PRO 18A Professional Series
Recommended for professional audio as a woofer in vented enclosures.
SPECIFICATION - Nominal Basket Diameter 18“, 457.2 mm
- Nominal Impedance 8 ohms
- Power Rating Watts 650 W / Music Program 1300 W
- Resonance 28 Hz
- Usable Frequency Range 41 Hz - 2.4 kHz
- Sensitivity 99
- Magnet Weight 120 oz.
- Gap Height 0.375“, 9.53 mm
- Voice Coil Diameter 3“, 76.2 mm
THIELE & Small Parameters - Resonant Frequency (fs) 28 Hz
- DC Resistance (Re) 6.29
- Coil Inductance (Le) 1.90 mH
- Mechanical Q (Qms) 8.28
- Electromagnetic Q (Qes) 0.30
- Total Q (Qts) 0.29
- Compliance Equivalent Volume (Vas) 441.2 liters / 15.6 cu. ft.
- Peak Diaphragm Displacement Volume 695 cc
- Mechanical Compliance of Suspension (Cms) 0.24 mm/N
- BL Product (BL) 22.1 T-M
- Diaphragm Mass inc. Airload (Mms) 130 grams
- Efficiency Bandwidth Product (EBP) 93
- Maximum Linear Excursion (Xmax) 6.1 mm
- Surface Area of Cone (Sd) 1140.0 cm²
- Maximum Mechanical Limit (Xlim) 18.0 mm
MOUNTING Information - Recommended Enclosure Volume
Sealed N/A
Vented 93-212 liters/3.3-7.5 cu.ft. - Overall Diameter 18“, 457.2 mm
- Baffle Hole Diameter 16.56“, 420.5 mm
- Front Sealing Gasket fitted as standard
- Rear Sealing Gasket fitted as standard
- Mounting Holes Diameter 0.28“, 7.1 mm
- Mounting Holes B.C.D. 17.25“, 438.2 mm
- Depth 8.15“, 207 mm
MATERIALS of Construction - Copper voice coil
- Polyimide former
- Ferrite magnet
- Vented and extended core
- Die-cast aluminum basket
- Paper Cone
- Cloth cone edge
- Solid composition paper dust cap
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- 95 dB Sensitivity 1 W / 1 m
- 1500 W Power handling
- 4" Copper sandwich voice coil for low power compression
- Neodymium magnet system
- Double treated cone for water protection
- Triple aluminum demodulating rings for ultra low distortion
- Optimal for high output Subwoofers
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Nominal Diameter 460 mm (18 in)
Overall Diameter 460 mm (18.11 in)
Bolt Circle Diameter 440 mm (17.32 in)
Baffle Cutout Diameter 424 mm (16.7 in)
Depth 202 mm (7.95 in)
Flange and Gasket Thickness 13.9 mm (0.55 in)
Net Weight 4.7 Kg (10.4 lb)
Shipping Box
(Single Carton Box) 536x536x293 mm (21.1x21.1x11.5 in)
Shipping Weight 6 Kg (13.2 lb)
Nominal Impedance 8 Ohm
Minimum Impedance 6 Ohm
Nominal Power Handling *** 600 W
Maximum Power Handling **** 1200 W
Sensitivity (1W/1m) 99 dB
Frequency Range 30÷3150 Hz
Voice Coil Diameter 77 mm (3 in)
Winding Material Cu
Former Material Glass Fiber
Winding Depth 22 mm (0.87 in)
Magnetic Gap Depth 10.5 mm (0.41 in)
Flux Density 1.2 T
Fs 30 Hz
Re 5.1 Ohm
Qes 0.34
Qms 8.68
Qts 0.33
Vas 404.2 dm^3 (14.27 ft^3)
Sd 1166 cm^2 (180.7 in^2)
Xmax * 9.25 mm
Xdamage ** 17.5 mm
Mms 134.3 g
Bl 19.5 N/A
Le 1.35 mH
Mmd 112.6 g
Cms 0.21 mm/N
Rms 2.91 Kg/s
Eta Zero 3.1 %
EBP 88 Hz
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- 95 dB Sensitivity 1 W / 1 m
- 1.200 W Power Handling
- 4" Copper Sandwich Voice Coil for low Power Compression
- Neodymium Magnet System
- Double treated Cone for Water Protection
- Triple Aluminum demodulating Rings for ultra low Distortion
- Optimal for high Output Subwoofers
- Leight Weight Carbon Fiber Diaphragm
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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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Woofer 18 1000WRMS 97dB
2000 W continuous program power capacity |
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100 mm (4 in) copper voice coil |
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35 – 1000 Hz response |
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97 dB sensitivity |
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Aluminium demodulating ring allows a very low distortion figure |
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Double silicone spider with optimized compliance |
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Ventilated voice coil gap for reduced power compression |
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