EMINENCE ESP18A Sigma Pro-18 – 18″ Speaker 650 W 8 Ohms – Alu Basket

SIGMA PRO 18A Professional Series

Recommended for professional audio as a woofer in vented enclosures.

• 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

• 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

• 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

• 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

• 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

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
      

• 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

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