Brand NEW! Including 90 Days USA Factory Warranty. More than just a pretty speaker, the Dayton Audio Designer Series DSA115-8 4" woofer features an extremely neutral response and high Xmax capability. Key Features Cosmetic frame with low profile lip, designed for front mounting?no countersinking required! Low distortion motor system with copper shorting ring Black anodized aluminum cone, half roll rubber surround for durability and accurate reproduction Smooth frequency response and linear roll-off simplify filter design Vented pole piece for minimized power compression and maximized reliability Retains the same "family look" as the popular Dayton Audio DVC Series subwoofers and passive radiators Generous Xmax capability encourages use of moderate bass boost to tailor the response The Designer Series by Dayton Audio was developed specifically with the speaker designer in mind. It is an affordable, attractive line of drivers that puts performance first. Careful engineering ensures that each speaker in the series is capable of handling full rated power at the lowest possible frequencies ? without exceeding Xmax. These speakers combine useful performance parameters with elegant style. Carefully optimized to provide superb audio reproduction when incorporated into a wide variety of enclosures and alignments, the Designer Series transducers put a beautiful face on audiophile excellence. Product Specifications Nominal Diameter 4" Moving Mass Of Diaphragm (Mmd) 6.7 Power Handling (RMS) 35 Watts Power Handling (MAX) 70 Watts Impedance 8? Frequency Response 63 to 11,000Hz Sensitivity 86.1dB 2.83V/1m Voice Coil Diameter 1" Thiele-Small Parameters Resonant Frequency (Fs) 63.25Hz DC Resistance (Re) 5.9? Voice Coil Inductance (Le) 0.63mH Mechanical Q (Qms) 2 Electromagnetic Q (Qes) 0.53 Total Q (Qts) 0.42 Compliance Equivalent Volume (Vas) 0.14ft Mechanical Compliance of Suspension (Cms) 0.94mm/N BL Product (BL) 5.44T·m Maximum Linear Excursion (Xmax) 4.1mm Surface Area of Cone (Sd) 54.1cm Materials of Construction Cone Material Aluminum Surround Material Rubber Voice Coil Wire Material Copper Voice Coil Former Aluminum Basket / Frame Material Steel Magnet Material Ferrite Mounting Information Overall Outside Diameter 4.55" Baffle Cutout Diameter 3.69" Depth 2.15" # Mounting Holes 4 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 0.05ft Sealed F3 119Hz Vented Volume 0.14ft Vented F3 62Hz - All international buyers are responsible for all tax, duties and/or customs fees.