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

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!

Features:

• 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"

Specifications:

• SPECIFICATION
• Nominal Basket 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