Brand NEW! 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. Highlights ? Three-part paper composite diaphragm featuring paper, Kevlar, and glass fibers ? Similar cosmetics and design features as original aluminum Dayton Audio Reference Series ? Perfect for use a woofer, midwoofer, or dedicated midrange driver Dayton Audio RS100P-8 4" Reference Paper Midwoofer 8 Ohm 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 - 4" ? Power Handling (RMS) - 30 Watts ? Power Handling (max) - 45 Watts ? Impedance - 8 ohms ? Frequency Response - 90 to 12,500 Hz ? Sensitivity - 86.2 dB 2.83V/1m ? Voice Coil Diameter - 1? Thiele-Small Parameters ? Resonant Frequency (Fs) - 95.6 Hz ? DC Resistance (Re) - 6.6 ohms ? Voice Coil Inductance (Le) - 0.51 mH ? Mechanical Q (Qms) - 2.18 ? Electromagnetic Q (Qes) - 0.71 ? Total Q (Qts) - 0.54 ? Compliance Equivalent Volume (Vas) - 0.06 ft. ? Mechanical Compliance of Suspension (Cms) - 0.98 mm/N ? BL Product (BL) - 3.95 Tm ? Diaphragm Mass Inc. Airload (Mms) - 2.8g ? Maximum Linear Excursion (Xmax) - 3.7 mm ? Surface Area of Cone (Sd) - 37.4 cm Materials of Construction ? Cone Material - Paper / Kevlar ? Surround Materia - lRubber ? Basket / Frame Material - Cast Aluminum ? Magnet Material - Ferrite Mounting Information ? Overall Outside Diameter - 3.86" ? Baffle Cutout Diameter - 3.04" ? Depth - 2.01" ? # Mounting Holes - 6 - All international buyers are responsible for all tax, duties and/or customs fees.