Brand NEW! Including 90 Days USA Factory Warranty. The Dayton Audio Classic Series 15" woofer is excellent as a replacement driver or for new system design and construction. The versatile set of parameters makes it suitable for sealed or vented enclosure designs. Treated paper cone provides smooth response and low energy storage Aluminum former, vented pole piece, and porous dustcap for high power handling Large diameter flat spider and healthy Xmax for clean bass Bring those old vintage speakers back to life Dayton Audio Classic Series woofers are excellent for use as replacement speakers or for new loudspeaker system design and construction. The DC380-8 15" woofer has developed quite a reputation for having the best bang-for-the-buck performance and value available anywhere. Smooth frequency response and extended bass performance make this driver ideal for use in large format two-way and classic three-way loudspeaker designs. A Qts of 0.35 allows the DC300-8 to work well in both sealed and ported speaker enclosures. A non-pressed treated paper cone allows for smooth frequency response, while the high temperature aluminum voice coil and vented pole piece combine to increase power handling without compression. Longevity is ensured with the use of a rubber surround, treated cloth dust cap, and an extended bump plate. Product Specifications Nominal Diameter 15" Bolt Circle Diameter 14.37 Moving Mass Of Diaphragm (Mmd) 182.9 Power Handling (RMS) 100 Watts Power Handling (MAX) 200 Watts Impedance 8? Frequency Response 20 to 1,500Hz Sensitivity 91.8dB 2.83V/1m Voice Coil Diameter 2" Thiele-Small Parameters Resonant Frequency (Fs) 18.8Hz DC Resistance (Re) 6.4? Voice Coil Inductance (Le) 3.09mH Mechanical Q (Qms) 2.87 Electromagnetic Q (Qes) 0.34 Total Q (Qts) 0.3 Compliance Equivalent Volume (Vas) 13.82ft Mechanical Compliance of Suspension (Cms) 0.39mm/N BL Product (BL) 20.4T·m Maximum Linear Excursion (Xmax) 4.35mm Surface Area of Cone (Sd) 834.7cm Materials of Construction Cone Material Treated Paper Surround Material Rubber Voice Coil Wire Material Copper Voice Coil Former Aluminum Basket / Frame Material Steel Magnet Material Ferrite Mounting Information Overall Outside Diameter 15.16" Baffle Cutout Diameter 13.74" Depth 6.38" # Mounting Holes 8 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 2ft Sealed F3 53Hz Vented Volume 5.27ft Vented F3 32Hz - All international buyers are responsible for all tax, duties and/or customs fees.