Definimax 4018LF 18" Eminence Woofer 1200 RMS

SPECIFICATIONS

Nominal Basket Diameter

18", 381mm

Nominal Impedance*

8 ohms

Power Rating**

Watts

1200W

Music Program

2400W

Resonance

42 Hz

Usable Frequency Range

35 Hz – 1.2 kHz

Sensitivity***

97 dB

Magnet Weight

109 oz.

Gap Height

0.37", 9.53mm

Voice Coil Diameter

4", 101.2mm

THIELE & SMALL PARAMETERS

Resonant Frequency (fs)

42Hz

DC Resistance (Re)

5.04

Coil Inductance (Le)

1.49mH

Mechanical Q (Qms)

6.73

Electromagnetic Q (Qes)

0.54

Total Q (Qts)

0.50

Compliance Equivalent Volume (Vas)

115.4 liters / 4.1 cu.ft.

Peak Diaphragm Displacement Volume (Vd)

786 cc

Mechanical Compliance of Suspension (Cms)

0.11mm/N

BL Product (BL)

18.4 T-M

Diaphragm Mass Inc. Airload (MMs)

139 grams

Efficiency Bandwidth Product (EBP)

77

Maximum Linear Excursion (Xmax)

 9 mm

Surface Area of Cone (Sd)

872.9 cm2

Maximum Mechanical Limit (Xlim)

15.5mm

MOUNTING INFORMATION

Recommended Enclosure Volume

Sealed

49 liters / 0.1.7-2.1 cu.ft.

Vented

82-181 liters / 2.9-6.4 cu.ft.

Driver Volume Displaced

253 cu.in. / 4.3 liters

Overall Diameter

15.21", 386mm

Baffle Hole Diameter

14.0", 355.6 mm

Front Sealing Gasket

Fitted as standard

Rear Sealing Gasket

Fitted as standard

Mounting Holes Diameter

0.28", 6.9mm

Mounting Holes B.C.D.

14.56", 369.8mm

Depth

6.56", 166 mm

Net Weight

23.7 lbs, 10.8 kg

Shipping Weight

26 lbs, 12 kgs

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

Paper cone

Cone Edge Composition

Cloth cone edge

Dust Cap Composition

Solid composition paper dust cap