Brand NEW! Including 90 Days USA Factory Warranty. 5-1/4" aluminum cone woofer with rubber surround, flat spider, and special composite dustcap. Key Features ? Makes a great studio monitor speaker ? Aluminum cone offers a flat frequency response ? Cosmetically appealing integrated trim ring ? Very low distortion driver 5-1/4" aluminum cone woofer with rubber surround, flat spider, and special composite dustcap. The cosmetic stamped steel frame provides a very high-class and professional look to your next speaker design. The aluminum cone offers a flat frequency response in the passband region with very low distortion. Product Specifications Nominal Diameter 5-1/4" Bolt Circle Diameter 4.96 Moving Mass Of Diaphragm (Mmd) 8.54 Power Handling (RMS) 30 Watts Power Handling (MAX) 60 Watts Impedance 8? Frequency Response 50 to 15,000Hz Sensitivity 85dB 2.83V/1m Voice Coil Diameter 1" Thiele-Small Parameters Resonant Frequency (Fs) 56.5Hz DC Resistance (Re) 6.4? Voice Coil Inductance (Le) 0.97mH Mechanical Q (Qms) 2.61 Electromagnetic Q (Qes) 0.68 Total Q (Qts) 0.54 Compliance Equivalent Volume (Vas) 0.26ft Mechanical Compliance of Suspension (Cms) 0.93mm/N BL Product (BL) 5.32T·m Maximum Linear Excursion (Xmax) 3mm Surface Area of Cone (Sd) 75.4cm Materials of Construction Cone Material Aluminum Surround Material Rubber Voice Coil Wire Material Copper Voice Coil Former Aluminum Basket / Frame Material Steel Magnet Material Ferrite Mounting Information Overall Outside Diameter 5.31" Baffle Cutout Diameter 4.39" Depth 2.48" # Mounting Holes 4 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 0.16ft Sealed F3 89Hz Vented Volume 0.47ft Vented F3 44Hz - All international buyers are responsible for all tax, duties and/or customs fees.