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. The black anodized cone, rubber surround, and custom basket give this driver a unique, high-end look. Key Features Extensively vented motor eliminates power compression and allows quiet excursion Triple shorting-ring motor for ultra-low distortion Heavy-gauge aluminum cones withstand pressures of small enclosures 4-layer high-temperature coils for maximum power handling Durable aramid fiber spider for greater mechanical control Unique, high-end look Optimized for small enclosures 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. Product Specifications Nominal Diameter 8" Moving Mass Of Diaphragm (Mmd) 99.3 Power Handling (RMS) 300 Watts Power Handling (MAX) 500 Watts Impedance 8? Frequency Response 30 to 1,500Hz Sensitivity 83.5dB 2.83V/1m Voice Coil Diameter 2" Thiele-Small Parameters Resonant Frequency (Fs) 29.6Hz DC Resistance (Re) 5.9? Voice Coil Inductance (Le) 1.46mH Mechanical Q (Qms) 2.78 Electromagnetic Q (Qes) 0.45 Total Q (Qts) 0.39 Compliance Equivalent Volume (Vas) 0.66ft Mechanical Compliance of Suspension (Cms) 0.29mm/N BL Product (BL) 15.6T·m Maximum Linear Excursion (Xmax) 12mm Surface Area of Cone (Sd) 213.8cm Materials of Construction Cone Material Aluminum Surround Material Rubber Basket / Frame Material Cast Aluminum Magnet Material Ferrite Mounting Information Overall Outside Diameter 8.39" Baffle Cutout Diameter 7.28" Depth 4.96" Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 0.28ft Sealed F3 58Hz Vented Volume 0.7ft Vented F3 32Hz - All international buyers are responsible for all tax, duties and/or customs fees.