Brand NEW! Including 90 Days USA Factory Warranty. One of the main design goals at Dayton Audio is to create loudspeakers that can achieve high levels of performance at reasonable prices. The Dayton Audio DC130B-4 5-1/4" woofer is a great example of this approach. It features a non-pressed treated paper cone, rubber half-roll surround, ASV voice coil, vented pole piece, coated cloth dust cap, and excellent low frequency response. Product Specifications Nominal Diameter 5-1/4" Bolt Circle Diameter 5.24 Power Handling (RMS) 40 Watts Power Handling (MAX) 80 Watts Impedance 4? Frequency Response 50 to 5,000Hz Sensitivity 92.1dB 2.83V/1m Voice Coil Diameter 1" Thiele-Small Parameters Resonant Frequency (Fs) 50.5Hz DC Resistance (Re) 3.2? Voice Coil Inductance (Le) 0.5mH Mechanical Q (Qms) 2.52 Electromagnetic Q (Qes) 0.41 Total Q (Qts) 0.35 Compliance Equivalent Volume (Vas) 0.43ft Mechanical Compliance of Suspension (Cms) 1mm/N BL Product (BL) 4.89T·m Diaphragm Mass Inc. Airload (Mms) 9.4g Maximum Linear Excursion (Xmax) 2.5mm Surface Area of Cone (Sd) 91.6cm Materials of Construction Cone Material Coated 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 5.71" Baffle Cutout Diameter 4.72" Depth 2.67" # Mounting Holes 4 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 0.1ft Sealed F3 120Hz Vented Volume 0.22ft Vented F3 72Hz - All international buyers are responsible for all tax, duties and/or customs fees.