Brand NEW! Including 90 Days USA Factory Warranty. Dayton Audio Reference Series paper cone drivers combine class-leading low distortion performance with the use of a proprietary cone blend. Now with a flatter frequency response and smoother high frequency roll-off allowing for extended bandwidth and easier crossover integration. Key Features ? Now with improved frequency response for easier crossover integration ? Three-part paper composite diaphragm featuring paper, Kevlar, and glass fibers ? Low-distortion motor, 6-hole cast frame, rubber surround, and solid aluminum phase plug ? Perfect for use as a woofer, midwoofer, or dedicated midrange driver ? 92.9 dB sensitivity and 6 mm of excursion Now with improved frequency response ? we tweaked the design and the result is a much a smoother high frequency roll-off allowing for extended bandwidth and easier crossover integration. The performance of the original groundbreaking Reference Series from Dayton Audio, now available with a paper cone! The Reference Series Paper drivers use a proprietary paper cone formulation combining natural paper pulp and synthetic Kevlar and glass fibers to create an advanced non-woven fiber composite that delivers the perfect combination of excellent detail and smooth, natural sonic character, plus a distinctive, classy look. Product Specifications Nominal Diameter 8" Bolt Circle Diameter 8.23 Moving Mass Of Diaphragm (Mmd) 25.0 Power Handling (RMS) 80 Watts Power Handling (MAX) 120 Watts Impedance 4? Frequency Response 35 to 5,500Hz Sensitivity 92.9dB 2.83V/1m Voice Coil Diameter 1.52" Thiele-Small Parameters Resonant Frequency (Fs) 37.7Hz DC Resistance (Re) 3.3? Voice Coil Inductance (Le) 0.51mH Mechanical Q (Qms) 1.85 Electromagnetic Q (Qes) 0.48 Total Q (Qts) 0.38 Compliance Equivalent Volume (Vas) 1.61ft Mechanical Compliance of Suspension (Cms) 0.71mm/N BL Product (BL) 6.4T·m Maximum Linear Excursion (Xmax) 6mm Surface Area of Cone (Sd) 213.8cm Materials of Construction Cone Material Paper / Kevlar Surround Material Rubber Basket / Frame Material Cast Aluminum Magnet Material Ferrite Mounting Information Overall Outside Diameter 8.78" Baffle Cutout Diameter 7.24" Depth 3.5" # Mounting Holes 6 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 0.45ft Sealed F3 83Hz Vented Volume 0.97ft Vented F3 49Hz - All international buyers are responsible for all tax, duties and/or customs fees.