Recommended for professional audio as a woofer in vented enclosures

SPECIFICATION
Nominal Basket Diameter	18", 457 mm
Nominal Impedance*	8 Ω
Power Rating*
Program Power	1300 W
Watts	650 W
Resonance	28 Hz
Usable Frequency Range	41 Hz - 2.4 kHz
Sensitivity*	99 dB
Magnet Weight	120 oz.
Gap Height	0.375", 9.5 mm
Voice Coil Diameter	3", 76 mm
THIELE & SMALL PARAMETERS
Resonant Frequency (fs)	28 Hz
DC Resistance (Re)	6.29 Ω
Coil Inductance (Le)	1.9m H
Mechanical Q (Qms)	8.28
Electromagnetic Q (Qes)	0.3
Total Q (Qts)	0.29
Compliance Equivalent Volume (Vas)	441.2 liters / 15.58 cu.ft.
Peak Diaphragm Displacement Volume (Vd)	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 cm2
Maximum Mechanical Limit (Xlim)	18 mm
MOUNTING INFORMATION
Recommended Enclosure Volume
Sealed	N/a
Vented	93-212 liters / 3.3-7.5 cu.ft.
Driver Volume Displaced	0.234 cu.ft. / 6.62 liters
Overall Diameter	18", 457.2 mm
Baffle Hole Diameter	16.56", 420.6 mm
Front Sealing Gasket	Yes
Rear Sealing Gasket	Yes
Mounting Holes Diameter	0.28", 7.1mm
Mounting Holes B.C.D.	17.25", 438.2mm
Depth	8.15", 207 mm
Net Weight	24.5 lbs, 11.11 kg
Shipping Weight	28.1 lbs, 12.75 kgs
MATERIALS OF CONSTRUCTION
Coil Construction	Copper voice coil
Coil Former	Polyimide former
Magnet Composition	Ferrite magnet
Core Details	Vented and extended core

Basket Materials	Die-cast aluminum basket
Cone Composition	Paper cone
Cone Edge Composition	Cloth cone edge
Dust Cap Composition	Solid composition paper dust cap

Eminence SIGMAPRO-18A2 18in Speaker 650w 8 Ohm