Eminence DEFINIMAX 4018LF
Recommended for professional audio and bass as a low distortion sub-woofer in
single or multi-driver designs.
SPECIFICATIONS
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 0.37", 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
