Brand NEW! Including 90 Days USA Factory Warranty. The Designer Series DS135-8 from Dayton Audio brings great audio fidelity and superior cosmetics to the 5" woofer category. Key Features ? Cosmetic frame with low profile lip, designed for front mounting?no countersinking required! ? Coated paper cone, half roll rubber surround for durability and accurate reproduction ? Optimized to yield a low 3 dB down point and high potential output in a reasonably sized cabinet ? Smooth frequency response and linear roll-off simplify filter design, guaranteeing good results with off-the-shelf crossovers ? Vented pole piece for minimized power compression and maximized reliability ? Generous Xmax capability encourages use of moderate bass boost to tailor the response ? Retains the same "family look" as the popular Dayton Audio DVC Series subwoofers and passive radiators 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. ? Suggested enclosures: Sealed cabinet: Type: Acoustic suspension (alpha 3.0), Qtc 0.60; Size (internal) including volume displaced by driver: 0.1 ft; Internal cabinet dimensions (golden ratio): 9-1/8"H x 5-5/8"W x 3-1/2"D. Typical results: 3 dB down-point (f3): 118 Hz; Low frequency limit at rated power without exceeding conventional Xmax (i.e. (voice coil length ? gap height) / 2)): 50 Hz. Vented cabinet: Type: Bass reflex; Size (internal) including volume displaced by driver and port: 0.17 ft; Internal cabinet dimensions (golden ratio): 10-3/4"H x 6-5/8"W x 4-1/8"D; Port dimensions (with flared exit): 1" dia. x 4"L. Typical results: 3 dB down-point (f3): 66 Hz; Tuning frequency (fb): 62 Hz; Low frequency limit at rated power without exceeding conventional Xmax Product Specifications Nominal Diameter 5" Bolt Circle Diameter 4.96 Moving Mass Of Diaphragm (Mmd) 9.7 Power Handling (RMS) 50 Watts Power Handling (MAX) 100 Watts Impedance 8? Frequency Response 50 to 7,000Hz Sensitivity 86.6dB 2.83V/1m Voice Coil Diameter 1" Thiele-Small Parameters Resonant Frequency (Fs) 52.5Hz DC Resistance (Re) 5.9? Voice Coil Inductance (Le) 0.84mH Mechanical Q (Qms) 2.02 Electromagnetic Q (Qes) 0.48 Total Q (Qts) 0.39 Compliance Equivalent Volume (Vas) 0.257ft Mechanical Compliance of Suspension (Cms) 0.95mm/N BL Product (BL) 6.23T·m Maximum Linear Excursion (Xmax) 4.85mm Surface Area of Cone (Sd) 75.4cm 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 5.31" Baffle Cutout Diameter 4.39" Depth 2.7" # Mounting Holes 4 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 0.07ft Sealed F3 113Hz Vented Volume 0.15ft Vented F3 66Hz - All international buyers are responsible for all tax, duties and/or customs fees.