Brand NEW! Including 90 Days USA Factory Warranty. Dayton Audio Reference Series RS180-8 7" woofers deliver exceptional clarity, detail, and dynamics--and of course, incredibly low distortion. Highlights One of the lowest distortion, highest resolution driver series available Low-distortion high-excursion motor system with two short-circuit paths Compliant suspension and rigid black anodized aluminum cone for strong bass performance Heavy-duty 6-hole cast frame, low-loss rubber surround, and solid aluminum phase plug Designed and engineered in the USA The Dayton Audio Reference Series was conceived with one goal in mind?low distortion. Each speaker was carefully designed and optimized to offer the highest performance with the lowest distortion levels. At the same time, by focusing on features that contribute to sound quality and eliminating unnecessary frills, the drivers offer value unparalleled in the industry. Dayton Audio Reference Series RS180-8 7" woofers deliver exceptional clarity, detail, and dynamics?and of course, incredibly low distortion. Product Specifications Nominal Diameter7" Power Handling (RMS) - 60 Watts Power Handling (max) - 120 Watts Impedance - 8 ohms Frequency Response - 39 to 3,600 Hz Sensitivity - 87.1 dB 2.83V/1m Voice Coil Diameter - 1.5" Thiele-Small Parameters Resonant Frequency (Fs) - 35.7 Hz DC Resistance (Re) - 6.4 ohms Voice Coil Inductance (Le) - 0.73 mH Mechanical Q (Qms)1.22 Electromagnetic Q (Qes) - 0.42 Total Q (Qts) - 0.31 Compliance Equivalent Volume (Vas) - 0.86 ft. Mechanical Compliance of Suspension (Cms) - 1.12 mm/N BL Product (BL) - 7.82 Tm Diaphragm Mass Inc. Airload (Mms) - 17.9g Maximum Linear Excursion (Xmax) - 6 mm Surface Area of Cone (Sd) - 124.7 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 - 7.11" Baffle Cutout Diameter - 5.75" Depth - 3.19" Bolt Circle Diameter - 6.63" # Mounting Holes - 6 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume - 0.16 ft. Sealed F3 - 105 Hz Vented Volume - 0.3 ft. Vented F3 - 65 Hz - All international buyers are responsible for all tax, duties and/or customs fees.