DEFINIMAX 4018LF 18" Professional Series Speaker - Low Distortion PA Woofer

Recommended for professional audio and bass as a high-power, low-distortion subwoofer in single or multi-driver designs.

SPECIFICATION
Nominal Basket Diameter	18", 457 mm
Nominal Impedance*	8 Ω
Power Rating*
Program Power	2400 W
Watts	1200 W
Resonance	30 Hz
Usable Frequency Range	31 Hz - 0.2 kHz
Sensitivity*	94.9 dB
Magnet Weight	109 oz.
Gap Height	0.375", 9.5 mm
Voice Coil Diameter	4", 102 mm
THIELE & SMALL PARAMETERS
Resonant Frequency (fs)	30 Hz
DC Resistance (Re)	6.1 Ω
Coil Inductance (Le)	4.54m H
Mechanical Q (Qms)	11.95
Electromagnetic Q (Qes)	0.35
Total Q (Qts)	0.34
Compliance Equivalent Volume (Vas)	254.71 liters / 9 cu.ft.
Peak Diaphragm Displacement Volume (Vd)	1018.1 cc
Mechanical Compliance of Suspension (Cms)	0.13 mm/N
BL Product (BL)	26.75 T-M
Diaphragm Mass Inc. Airload (MMs)	217 grams
Efficiency Bandwidth Product (EBP)	86
Maximum Linear Excursion (Xmax)	8.57 mm
Surface Area of Cone (Sd)	1188 cm2
Maximum Mechanical Limit (Xlim)	15.9 mm
MOUNTING INFORMATION
Recommended Enclosure Volume
Sealed	N/a
Vented	99.11-226.54 liters / 3.5-8 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	8.13", 206.5 mm
Net Weight	24 lbs, 10.89 kg
Shipping Weight	26 lbs, 11.79 kgs
MATERIALS OF CONSTRUCTION
Coil Construction	Copper voice coil
Coil Former	Polyimide former
Magnet Composition	Ferrite magnet
Core Details	Undercut with aluminum shorting ring and Core Periphery Ventilation

Basket Materials	Die-cast aluminum basket
Cone Composition	Water resistant paper cone
Cone Edge Composition	Cloth cone edge
Dust Cap Composition	Water resistant treated paper dust cap