Click Here to Download PDF Spec Sheet
Click Here to Download PDF Cabinet Design
DEFINIMAX™ 4018LF
SPECIFICATION
Nominal Basket Diameter 18", 457.2mm
Nominal Impedance* 8 ohms
Power Rating
Watts 800W
Music Program 1600W
Resonance 32Hz
Usable Frequency Range 36Hz-200Hz
Sensitivity*** 95
Magnet Weight 109 oz.
Gap Height 0.375", 9.53mm
Voice Coil Diameter 4", 101.6mm

THIELE & SMALL PARAMETERS
Resonant Frequency (fs) 32Hz
DC Resistance (Re) 6.19
Coil Inductance (Le) 4.78mH
Mechanical Q (Qms) 10.38
Electromagnetic Q (Qes) 0.36
Total Q (Qts) 0.35
Compliance Equivalent Volume (Vas) 237.9 liters / 8.4 cu.ft.
Peak Diaphragm Displacement Volume (Vd) 939cc
Mechanical Compliance of Suspension (Cms) 0.12mm/N
BL Product (BL) 27.0 T-M
Diaphram Mass inc. Airload (Mms) 211 grams
Efficiency Bandwidth Product (EBP) 89
Maximum Linear Excursion (Xmax) 7.9mm
Surface Area of Cone (Sd) 1188.0 cm2
Maximum Mechanical Limit (Xlim) 15.9mm

MOUNTING INFORMATION
Recommended Enclosure
Sealed N/A
Vented 125-210 liters/ 4.4-7.4 cu.ft.
Overall Diameter 18", 457.2mm
Baffle Hole Diameter 16.57", 420.9mm
Front Sealing Gasket Fitted as standard
Rear Sealing Gasket Fitted as standard
Mounting Holes Diameter 0.28", 7.1mm
Mounting Holes B.C. D. 17.25", 438.2mm
Depth 8.13", 206.4mm
Net Weight 24 lbs, 10.9 kg
Shipping Weight 26 lbs, 11.8 kg

MATERIALS OF CONSTRUCTION
Coil Construction Copper voice coil
Coil Former Polyimide former
Magnet Composition Ferrite magnet
Core Details Undercut with copper shorting ring and Core Periphery Ventilation
Basket Materials Die-cast aluminum basket
Cone Composition Acrylic Wetlook Paper Cone
Cone Edge Composition Cloth cone edge
Dustcap Composition Acrylic wetlook paper dust cap