Brand NEW! Including 90 Days USA Factory Warranty. The Dayton Audio Reference Series subwoofers take the quality and performance of the much acclaimed RS line into the subwoofer realm. As with the rest of the Reference Series, the main focus of these subwoofers is ultra-low-distortion. Highlights Dual 4 ohm voice coils Extensively vented motor eliminates compression and allows quiet excursion Extra-thick black anodized aluminum cone for maximum rigidity Triple shorting-ring motor for ultra-low distortion 4-layer coil for high power handling Parameters optimized for small enclosures Highest quality materials throughout for long-lasting performance The Dayton Audio Reference Series subwoofers take the quality and performance of the much acclaimed RS line into the subwoofer realm. As with the rest of the Reference Series, the main focus of these subwoofers is ultra-low-distortion. Second, third, and intermodulation distortion are kept extremely low by utilizing three short-circuit paths within the motor structure. A durable aramid fiber spider and extensive venting throughout provide quiet and uniform excursion. The black anodized cone, rubber surround, and custom basket give this driver a unique, high-end look. The High Output (HO) drivers are optimized for automotive applications and equalized high-power home subwoofers. Product Specifications Nominal Diameter - 12" Power Handling (RMS) - 700 Watts Power Handling (max) - 1400 Watts Impedance - 4+4 ohms Frequency Response - 20 to 500 Hz Sensitivity - 84.6 dB 2.83V/1m Voice Coil Diameter - 2.58" Magnet Weight - 150 oz. Thiele-Small Parameters Resonant Frequency (Fs) - 21.5 Hz DC Resistance (Re) - 6.5 ohms Voice Coil Inductance (Le) - 3.17 mH Mechanical Q (Qms) - 3.70 Electromagnetic Q (Qes) - 0.41 Total Q (Qts) - 0.37 Compliance Equivalent Volume (Vas) - 2.165 ft. Mechanical Compliance of Suspension (Cms) - 0.17 mm/N BL Product (BL) - 26.5 Tm Diaphragm Mass Inc. Airload (Mms) - 327.7g Maximum Linear Excursion (Xmax) - 14 mm Surface Area of Cone (Sd) - 507.1 cm Materials of Construction Cone Material - Aluminum Surround Material - Rubber Voice Coil Wire Material - Copper Voice Coil Former - Aluminum Basket / Frame Material - Cast Aluminum Magnet Material - Ferrite Mounting Information Overall Outside Diameter - 12.36" Baffle Cutout Diameter - 11.1" Depth - 5.75" # Mounting Holes - 8 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume - 0.49 ft. Sealed F3 - 47 Hz Vented Volume - 1.36 ft. Vented F3 - 27 Hz - All international buyers are responsible for all tax, duties and/or customs fees.