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Dayton Audio DCS255-4 10″ Classic Subwoofer 4 Ohm The Dayton Audio Classic Series subwoofers offer solid value at lower price points. No compromises were made in the design, materials, or construction of these rugged 4-ohm powerhouses. The drivers feature a vented pole piece with copper cap, bumped back plate for improved excursion capability, Kevlar reinforced cone with rubber half-roll surround, and a high-temperature 4-layer copper voice coil wound on a polyimide former. Product Specifications Nominal Diameter10″ Power Handling (RMS)200 Watts Power Handling (max)400 Watts Impedance4 ohms Frequency Response31 to 200 Hz Sensitivity89 dB 1W/1m Voice Coil Diameter2″ Thiele-Small Parameters Resonant Frequency (Fs)30.9 Hz DC Resistance (Re)3 ohms Voice Coil Inductance (Le)1.6 mH Mechanical Q (Qms)4.89 Electromagnetic Q (Qes)0.37 Total Q (Qts)0.34 Compliance Equivalent Volume (Vas)1.69 ft.³ Mechanical Compliance of Suspension (Cms)0.28 mm/N BL Product (BL)12.13 Tm Diaphragm Mass Inc. Airload (Mms)93.4g Maximum Linear Excursion (Xmax)8.3 mm Surface Area of Cone (Sd)346.4 cm² Materials of Construction Cone MaterialPaper / Kevlar Surround MaterialRubber Voice Coil Wire MaterialCopper Voice Coil FormerKapton® / Polyimide Basket / Frame MaterialSteel Magnet MaterialFerrite Mounting Information Overall Outside Diameter10.16″ Baffle Cutout Diameter9.13″ Depth5.54″ # Mounting Holes8 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume0.3 ft.³ Sealed F378 Hz Vented Volume0.75 ft.³ Vented F347 Hz