Additional Details ------------------------------ Product description: Quick Overview Dayton Audio?s CE40-28P-8 is an economical mini speaker that features a high-output neodymium motor, a lightweight paper cone, a front gasket, and a molded plastic frame drilled for conventional mounting. 8 ohm impedance. Product Highlights Racetrack-shaped paper cone with fabric surround Slim design for narrow and shallow profile installation High-energy neodymium motor Product Manuals / Spec Sheets / Downloads Dayton Audio CE40-28P-8 Specification SheetBuying Options Buy NowBuy Internationally Product Description Dayton Audio is pleased to introduce the new Commercial Engineering (CE) Series of small loudspeaker drivers. Engineers, designers, and integrators will benefit from how effortlessly these speaker components satisfy the diverse demands associated with consumer electronics and audio-enabled projects. Multiple types and styles are available within the CE Series driver family. Each was produced to provide excellent audio quality no matter what the overall system design goals may be, and to suit a wide spectrum of engineering requirements. These versatile yet economical loudspeakers are available in sizes from 28 mm (1-1/8") to 90 mm (3-1/2") in diameter, and with power ratings from 1.5 watts to 5 watts continuous RMS power. The CE40-20P-8 is a slim driver that?s perfect for applications that require its shallow profile and rectangular shape. Its high-quality design features a paper cone, fabric surround, textile spider, high-performance neodymium motor, and an injection-molded frame that?s drilled for conventional mounting. Product Details Speaker Series CE Series Model Number CE40-28P-8 Color Black Unit of Measure Each UPC 848791000362 Warranty - Parts 5 Years Warranty - Labor 5 Years Product Shipping Weight (lbs.) 0.05 Speaker Type Mini Speaker Power Handling (RMS) 2 watts Power Handling (max) 4 watts Continuous Program Power -- Impedance 8 ohms Sensitivity 72 dB @ 1W/1m Frequency Response 550 - 15,000 Hz Voice Coil Diameter 13 mm Magnet Weight -- DC Resistance (Re) 7.0 ohms Voice Coil Inductance (Le) 0.26 mH Resonant Frequency (Fs) 607.6 Hz Mechanical Q (Qms) 3.96 Electromagnetic Q (Qes) 9.87 Total Q (Qts) 2.83 Diaphragm Mass Inc. Airload (Mms) 0.37 g Moving Mass Of Diaphragm (Mmd) -- Mechanical Compliance of Suspension (Cms) 0.18 mm/N Surface Area Of Cone (Sd) 5.28 cm Volume of Displacement (Vd) .001 cm BL Product (BL) 1.03 Tm Compliance Equivalent Volume (Vas) 0.01 liters Maximum Linear Excursion (Xmax) 0.1 mm Drivers Mechanical Losses (Rms) -- Cone / Diaphragm Material Paper Cone Entry / Exit Diameter -- Surround Material Cloth Voice Coil Wire Material -- Voice Coil Former -- Basket/Frame Material -- Magnet Material Neodymium Overall Outside Diameter 28.50 mm X 40 mm Overall Depth 11 mm Baffle Cutout Diameter -- # Mounting Holes 4 Mounting Hole Diameter -- Bolt Circle Diameter -- Product Weight --