Eminence Sigma Pro 18A-2 18" Cast Frame Speaker Driver

PA SKU # EMN SIGMAPRO18A2 MFR # SIGMA PRO-18A-2 UPC # 876358000395
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  • Product Highlights
  • Copper Voice Coil on Polyimide Former
  • Die-Cast Aluminum Basket
  • Vented & Extended Pole Piece
  • Paper Cone with Cloth Cone Edge

18" Woofer for Vented Enclosures in Professional Audio Applications

The Eminence Sigma Pro-18A-2 18" cast frame speaker is recommended for professional audio as a woofer or subwoofer in vented enclosures. It has been engineered for durability as well as exceptional sound quality, and will serve well when loaded into high-output live sound or music playback systems. Made in the USA. 7-year manufacturer's warranty!

  • Nominal Basket Diameter: 18"
  • Nominal Impedance: 8 ohms
  • Power Rating: 650W (1300W, Music Program)
  • Resonance: 28Hz
  • Usable Frequency Range: 41Hz-2.4kHz
  • Sensitivity: 99dB
  • Magnet Weight: 120 oz.
  • Gap Height: 0.37"
  • Voice Coil Diameter: 3"
  • Nominal Diameter: 18"
  • Power Handling (RMS): 650 Watts
  • Power Handling (max): 1300 Watts
  • Impedance: 8 ohms
  • Frequency Response: 41 to 2,400 Hz
  • Sensitivity: 99 dB 1W/1m
  • Voice Coil Diameter: 3"
  • Magnet Weight: 120 oz.
  • Thiele-Small Parameters
  • Resonant Frequency (Fs): 28 Hz
  • DC Resistance (Re): 6.29 ohms
  • Voice Coil Inductance (Le): 1.90 mH
  • Mechanical Q (Qms): 8.28
  • Electromagnetic Q (Qes): 0.30
  • Total Q (Qts): 0.29
  • Compliance Equivalent Volume (Vas): 15.58 ft.³
  • Mechanical Compliance of Suspension (Cms): 0.24 mm/N
  • BL Product (BL): 22.1 Tm
  • Diaphragm Mass Inc. Airload (Mms): 130g
  • Maximum Linear Excursion (Xmax): 6.1 mm
  • Surface Area of Cone (Sd): 1,140 cm²
  • Materials of Construction
  • Cone Material: Paper
  • Surround Material: Cloth
  • Voice Coil Wire Material: Copper
  • Voice Coil Former: Kapton / Polyimide
  • Basket / Frame Material: Cast Aluminum
  • Magnet Material: Ferrite
  • Mounting Information
  • Overall Outside Diameter: 18"
  • Baffle Cutout Diameter: 16.56"
  • Depth: 8.15"
  • # Mounting Holes: 8
  • Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion)
  • Sealed Volume: 1.87 ft.³
  • Sealed F3: 83 Hz
  • Vented Volume: 4.33 ft.³
  • Vented F3: 53 Hz
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