Brand NEW! Including 90 Days USA Factory Warranty. Dayton Audio Reference Series paper cone drivers combine class-leading low distortion performance with super smooth frequency response due to the use of a proprietary cone blend. Key Features ? Three-part paper composite diaphragm featuring paper, Kevlar, and glass fibers ? Similar cosmetics and design features as original Reference Series with 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 ? 4 mm of Xmax and 85.8 dB sensitivity. 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 5" Moving Mass Of Diaphragm (Mmd) 5.10 Power Handling (RMS) 30 Watts Power Handling (MAX) 45 Watts Impedance 8? Frequency Response 70 to 10,000Hz Sensitivity 87.1dB 2.83V/1m Voice Coil Diameter 1? Thiele-Small Parameters Resonant Frequency (Fs) 70Hz DC Resistance (Re) 6.2? Voice Coil Inductance (Le) 0.62mH Mechanical Q (Qms) 2.56 Electromagnetic Q (Qes) 0.53 Total Q (Qts) 0.44 Compliance Equivalent Volume (Vas) 0.14ft Mechanical Compliance of Suspension (Cms) 1.02mm/N BL Product (BL) 5.08T·m Maximum Linear Excursion (Xmax) 4mm Surface Area of Cone (Sd) 52.8cm Materials of Construction Cone Material Paper / Kevlar 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 4.43" Baffle Cutout Diameter 3.70" Depth 2.16" # Mounting Holes 6 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 0.05ft Sealed F3 146Hz Vented Volume 0.13ft Vented F3 77Hz - All international buyers are responsible for all tax, duties and/or customs fees.