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SIGMA PRO 18-4

$160.21

SIGMA PRO 18-4

A 4 ohm version of the popular Sigma Pro 18, recommended for professional audio as a woofer in vented enclosures.

7 YEAR WARRANTY

SKU: SIGMA-PRO-18-4 Categories: ,

Description

SIGMA PRO 18-4

A 4 ohm version of the popular Sigma Pro 18, recommended for professional audio as a woofer in vented enclosures.

7 YEAR WARRANTY

Sigma_Pro_18_4

SPECIFICATION
Nominal Basket Diameter 18″, 457 mm
Nominal Impedance* 4 Ω
Power Rating*
Program Power 1400 W
Watts 700 W
Resonance 32 Hz
Usable Frequency Range 32 Hz – 2 kHz
Sensitivity* 97.6 dB
Magnet Weight 120 oz.
Gap Height 0.37″, 9.5 mm
Voice Coil Diameter 3″, 76 mm
THIELE & SMALL PARAMETERS
Resonant Frequency (fs) 32 Hz
DC Resistance (Re) 3.35 Ω
Coil Inductance (Le) 0.85m H
Mechanical Q (Qms) 14.79
Electromagnetic Q (Qes) 0.3
Total Q (Qts) 0.29
Compliance Equivalent Volume (Vas) 360.84 liters / 12.74 cu.ft.
Peak Diaphragm Displacement Volume (Vd) 695 cc
Mechanical Compliance of Suspension (Cms) 0.2 mm/N
BL Product (BL) 16.54 T-M
Diaphragm Mass Inc. Airload (MMs) 121 grams
Efficiency Bandwidth Product (EBP) 107
Maximum Linear Excursion (Xmax) 7 mm
Surface Area of Cone (Sd) 1140 cm2
Maximum Mechanical Limit (Xlim) 18 mm
MOUNTING INFORMATION
Recommended Enclosure Volume
Sealed N/a
Vented 84.95-212.38 liters / 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