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Dayton Audio RS75-4 3″ Reference Full-Range Driver 4 Ohm The Dayton Audio Reference Series sets a new standard of value in high-performance loudspeaker drivers. Incorporating a low-distortion motor system with a copper ring, a copper cap, and an aluminum phase plug, the RS75-4 can outperform “boutique” drivers that cost several times the price. Its low-distortion characteristics and smooth response provide exceptional clarity, detail, and dynamics. Features a black anodized cone, heavy-duty 4-hole cast frame, low-loss rubber surround, and gold terminals. PRODUCT SPECIFICATIONS Power Handling (RMS) 15 Watts Power Handling (max) 30 Watts Impedance 4 ohms Frequency Response 150 to 20,000 Hz Sensitivity 83 dB 1W/1m Voice Coil Diameter 0.646″ THIELE-SMALL PARAMETERS Resonant Frequency (Fs) 154.1 Hz DC Resistance (Re) 3.2 ohms Voice Coil Inductance (Le) 0.19 mH Mechanical Q (Qms) 5.39 Electromagnetic Q (Qes) 0.91 Total Q (Qts) 0.78 Compliance Equivalent Volume (Vas) 0.01 ft.³ Mechanical Compliance of Suspension (Cms) 0.97 mm/N BL Product (BL) 1.94 Tm Diaphragm Mass Inc. Airload (Mms) 1.1g Maximum Linear Excursion (Xmax) 1.1 mm Surface Area of Cone (Sd) 15.2 cm² MATERIALS OF CONSTRUCTION Cone Material Aluminum Surround Material Rubber Voice Coil Wire Material Copper Voice Coil Former Aluminum Basket / Frame Material Cast Aluminum Magnet Material Ferrite MOUNTING INFORMATION Overall Outside Diameter 2.83″ Baffle Cutout Diameter 2.13″ Depth 1.52″ Bolt Circle Diameter 2.52″ # Mounting Holes 4 BOX SIZE (MODELED WITH BASS BOX USING HIGH FIDELITY SETTINGS) Sealed Volume 0.02 ft.³ Sealed F3 174 Hz Vented Volume 0.04 ft.³ Vented F3 93 Hz