Brand NEW! Including 90 Days USA Factory Warranty. Although it's true that the Dayton Audio Designer Series DSA175-8 is a nice looking and well thought-out 6-1/2" woofer, its ability to handle full rated power down to 39 Hz without exceeding Xmax is very impressive! 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 6-1/2" Bolt Circle Diameter 6.53 Power Handling (RMS) 70 Watts Power Handling (MAX) 140 Watts Impedance 8? Frequency Response 38 to 7,500Hz Sensitivity 88.1dB 2.83V/1m Voice Coil Diameter 1.4" Thiele-Small Parameters Resonant Frequency (Fs) 38.36Hz DC Resistance (Re) 5.8? Voice Coil Inductance (Le) 0.85mH Mechanical Q (Qms) 1.66 Electromagnetic Q (Qes) 0.35 Total Q (Qts) 0.29 Compliance Equivalent Volume (Vas) 0.66ft Mechanical Compliance of Suspension (Cms) 0.71mm/N BL Product (BL) 9.75T·m Diaphragm Mass Inc. Airload (Mms) 24.2g Maximum Linear Excursion (Xmax) 5.3mm Surface Area of Cone (Sd) 128.7cm 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 6.91" Baffle Cutout Diameter 5.67" Depth 3.17" # Mounting Holes 5 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 0.1ft Sealed F3 105Hz Vented Volume 0.2ft Vented F3 66Hz - All international buyers are responsible for all tax, duties and/or customs fees.