Additional Details ------------------------------ Bullet point: Excellent high frequency response for true full-range applications_Dual neodymium motor to create a symmetrical magnetic field for superb control_Large copper cap lowers distortion while improving high frequency response_Vented aluminum voice coil former with exceptional heat dissipation for high power handling_Exclusive 12-spoke open frame design provides extensive venting and minimal reflection_DIY friendly, oversized mounting flange makes installation simple_Matching tunable passive radiators also available! Product description: Quick Overview Dayton Audios DMA90-8 3-1/2" high performance full-range driver combines a rigid aluminum cone, powerful dual magnet neodymium motor, and a proprietary open frame to create a state of the art speaker that delivers low distortion, natural response, and amazing high frequency capability. Make the DMA90-8 the first choice for your next smart speaker, portable Bluetooth speaker, or even high output line array design. Product Highlights Excellent high frequency response for true full-range applications Dual neodymium motor to create a symmetrical magnetic field for superb control Large copper cap lowers distortion while improving high frequency response Vented aluminum voice coil former with exceptional heat dissipation for high power handling Exclusive 12-spoke open frame design provides extensive venting and minimal reflection DIY friendly, oversized mounting flange makes installation simple Matching tunable passive radiators also available! Product Manuals / Spec Sheets / Downloads Dayton Audio DMA90-8 Specification Sheet Dayton Audio DMA90-8 Data FilesBuying Options Buy NowBuy Internationally Product Description Providing high efficiency with low distortion, Dayton Audios DMA90-8 3-1/2" aluminum cone full-range is an ideal driver for use in many of todays modern speaker designs. Whether you are designing a portable Bluetooth speaker, sound bar, compact desktop speaker, or even a high output line array the DMA90-8 is the perfect full-range for the job. Designed for the highest performance while delivering maximum value, the no compromise design of the DMA90-8 produces true full-range output capability with minimal distortion. The motor uses dual neodymium magnets creating a strong and symmetrical magnetic field providing high efficiency with excellent cone control. The magnet assembly also includes a large copper cap and sleeve to lower inductance and distortion resulting in improved high frequency response. The 2-layer 1" voice coil is wound on a vented aluminum former providing excellent heat dissipation for high power handling and low power compression. A rubber surround and large spider keeps the lightweight aluminum cone linear with superb mechanical damping. In addition, the aluminum dust cap is attached directly to the voice coil former to improve high frequency response with terrific off axis performance. Holding everything together is a proprietary 12-spoke frame with an extremely open design that has extensive venting under the spider and ample room for high excursion. Furthermore, Dayton Audio designed the frame for all the DMA Series with DIY speaker builders in mind. The oversized mounting flange means that no precision cutouts are necessary. To ensure an easy installation, the terminals are oriented in such a way that no odd cutouts or notches are needed for connector or wire clearance. Finally, the corners have a 1/8" radius, meaning that for flush mounting you can get a perfect fit using any standard 1/4" straight cut router bit. Product Details Model Number DMA90-8 Color Black Unit of Measure Each UPC 848791005275 Warranty - Parts 5 Years Warranty - Labor 5 Years Product Shipping Weight (lbs.) 0.4 Speaker Type Full-Range Nominal Diameter 3.50" Power Handling (RMS) 30 watts Power Handling (max) 60 watts Continuous Program Power -- Impedance 8 ohms Sensitivity 85.3 dB @ 2.83V/1m Frequency Response 90-20,000 Hz Voice Coil Diameter 1" Magnet Weight -- DC Resistance (Re) 7.3 ohms Voice Coil Inductance (Le) 0.5 mH @ 1 kHz Resonant Frequency (Fs) 94.2 Hz Mechanical Q (Qms) 2.65 Electromagnetic Q (Qes) 0.73 Total Q (Qts) 0.57 Diaphragm Mass Inc. Airload (Mms) 3.7 g Moving Mass Of Diaphragm (Mmd) -- Mechanical Compliance of Suspension (Cms) 0.77 mm/N Surface Area Of Cone (Sd) 38.5 cm Volume of Displacement (Vd) 9.6 cm BL Product (BL) 4.7 Tm Compliance Equivalent Volume (Vas) 0.06 ft Maximum Linear Excursion (Xmax) 2.5 mm Drivers Mechanical Losses (Rms) -- Entry / Exit Diameter -- Surround Material -- Voice Coil Wire Material -- Voice Coil Former -- Basket/Frame Material -- Magnet Material -- Overall Outside Diameter -- Overall Depth -- Baffle Cutout Diameter -- Mounting Hole Diameter -- Bolt Circle Diameter -- Product Weight --