Eminence SIGMA PRO-18A 18" 650 Watts 8 Ohms Woofer Speaker - v.2

Overview

Recommended for professional audio as a woofer in vented enclosures.

Specifications

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