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Speaker - Eminence® Pro, 18", SIGMA PRO 18-4, 700W, 4Ω, Ferrite

Speaker - Eminence® Pro, 18", SIGMA PRO 18-4, 700W, 4Ω, Ferrite image 1
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SKU: P-A-SIGMAPRO18-4
Item ID: 039991
Price: $199.99
Note: special order items require additional lead time. See our page on special order items.
Note: this is a special order item.
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Special Order Item

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

SPECIFICATIONS

  • Nominal Basket Diameter: 18", 457 mm
  • Nominal Impedance: 4 Ω
  • Power Rating: 700 W
  • 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 Weigh:t 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
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