Additional Details ------------------------------ Bullet point: Thick, one-piece Nomex honeycomb covered cone with woven heavy-duty glass-fiber_Tall-boy rubber surround for extra-long linear excursion without reducing cone surface area_600 watts RMS power handling_Copper shorting rings and cap reduce distortion due to inductance variations_Dual 2 ohm, 2-layer copper voice coils_Large vented pole piece and under-spider venting_Black anodized aluminum former and black pole improves heat dissipation Product description: Quick Overview Dayton Audios Ultimax Series DVC subwoofers are purpose-built to move air and create clean, articulate, fast bass. Experience the apex of subwoofer design. Product Highlights Thick, one-piece Nomex honeycomb covered cone with woven heavy-duty glass-fiber Tall-boy rubber surround for extra-long linear excursion without reducing cone surface area 600 watts RMS power handling Copper shorting rings and cap reduce distortion due to inductance variations Dual 2 ohm, 2-layer copper voice coils Large vented pole piece and under-spider venting Black anodized aluminum former and black pole improves heat dissipation Product Manuals / Spec Sheets / Downloads Dayton Audio UM12-22 Specification Sheet Dayton Audio UM12-22 Data FilesBuying Options Buy NowBuy Internationally Product Description The Ultimax Series of dual voice coil subwoofers, from Dayton Audio, are not for the faint of heart. Built using the latest in subwoofer technology, Ultimax subwoofers are the pinnacle of low frequency driver design. An Ultimax subwoofer test the strength of your foundation with fast, articulate, gut-wrenching bass. Dual 2 ohm voice coils allow for stereo 2 ohm and mono 1 ohm wiring configurations when connecting to high current car audio and professional audio amplifiers to extract maximum power. For home audio applications, simply wire the voice coils in series for a benign 4 ohm load for greater amplifier compatibility. To improve power handling, increase thermal management, and reduce power compression, Dayton Audio designed the Ultimax Series with large black anodized formers and vented pole pieces, under-spider ventilation, and two-layer copper voice coils. Over 1-1/2" of travel (3/4" Xmax) is kept completely linear through the use of dual spiders that also limit distortion and rocking modes. "Tall-boy" rubber surrounds with integrated gaskets maintain driver surface area during extreme excursion moments. Thick, one-piece Nomex honeycomb covered cones are covered with woven, heavy-duty glass fibers creating ultra-still cones that resist deformation. A large copper sleeve and copper pole cap in the motor reduce energy storage from inductance, with the side benefit of lowering distortion for "faster" response. Large dual-stacked, high-energy magnets handle the heavy lifting and bring Qts down to a level where Ultimax subwoofers can be used in vented or sealed cabinets and enclosures. Cabinet Recommendations: Sealed 1.5 cubic ft. (net internal) with 1 lbs. of Acousta-Stuf polyfill, f3 of 35 Hz with a 0.707 Qtc alignment Vented 2 cubic ft. (net internal, not including driver or port volume) yields an f3 of 22 Hz Product Details Speaker Series Ultimax Series Model Number UM12-22 Color Black Unit of Measure Each UPC 844632099250 Warranty - Parts 5 Years Warranty - Labor 5 Years Product Shipping Weight (lbs.) 23 Speaker Type Subwoofer Power Handling (RMS) 600 watts Power Handling (max) 1,200 watts Continuous Program Power -- Impedance 2+2 ohms Sensitivity 86.7 dB @ 2.83V/1m Frequency Response 20 - 1,000 Hz Voice Coil Diameter 63.5 mm Magnet Weight -- DC Resistance (Re) 3.2 ohms Voice Coil Inductance (Le) 1.25 mH @ 1kHz Resonant Frequency (Fs) 26.2 Hz Mechanical Q (Qms) 3.62 Electromagnetic Q (Qes) 0.71 Total Q (Qts) 0.59 Diaphragm Mass Inc. Airload (Mms) 270g Moving Mass Of Diaphragm (Mmd) -- Mechanical Compliance of Suspension (Cms) 0.14 mm/N Surface Area Of Cone (Sd) 490.9 cm Volume of Displacement (Vd) 932.7 cm BL Product (BL) 14.2 Tm Compliance Equivalent Volume (Vas) 46.8 liters Maximum Linear Excursion (Xmax) 19 mm Drivers Mechanical Losses (Rms) -- Cone / Diaphragm Material Nomex Cone Entry / Exit Diameter -- Surround Material Rubber Voice Coil Wire Material Copper Voice Coil Former Aluminum Basket/Frame Material Cast Aluminum Magnet Material Ferrite Overall Outside Diameter 314.5 mm Overall Depth 158 mm Baffle Cutout Diameter 285 mm # Mounting Holes 8 Mounting Hole Diameter -- Bolt Circle Diameter -- Product Weight --