Brand NEW! Product Details Dayton Audio RS100-4 4" Reference Full-Range Driver 4 Ohm The Dayton Audio Reference Series sets a new standard of value in high-performance loudspeaker drivers. Utilizing a low-distortion motor system with two short-circuit paths and a rigid aluminum cone, the Reference Series can outperform drivers that cost several times the price. Their low-distortion characteristics and high excursion capabilities provide exceptional clarity, detail, and dynamics. Woofer features a black anodized cone, heavy-duty 6-hole cast frame, low-loss rubber surround, solid aluminum phase plug, and gold terminals. Product Specifications Nominal Diameter4"Power Handling (RMS)30 Watts Power Handling (max)60 WattsImpedance4 ohms Frequency Response80 to 20,000 HzSensitivity87.5 dB 2.83V/1m Voice Coil Diameter1" Thiele-Small Parameters Resonant Frequency (Fs)84.8 HzDC Resistance (Re)3 ohms Voice Coil Inductance (Le)0.28 mHMechanical Q (Qms)2.55 Electromagnetic Q (Qes)0.66Total Q (Qts)0.53 Compliance Equivalent Volume (Vas)0.05 ft.Mechanical Compliance of Suspension (Cms)0.83 mm/N BL Product (BL)3.18 TmDiaphragm Mass Inc. Airload (Mms)4.3g Maximum Linear Excursion (Xmax)4 mmSurface Area of Cone (Sd)35.3 cm Materials of Construction Cone MaterialAluminumSurround MaterialRubber Voice Coil Wire MaterialCopperVoice Coil FormerAluminum Basket / Frame MaterialCast AluminumMagnet MaterialFerrite Mounting Information Overall Outside Diameter3.86"Baffle Cutout Diameter3.06" Depth1.8"Bolt Circle Diameter3.54" # Mounting Holes6 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume0.04 ft.Sealed F3122 Hz Vented Volume0.1 ft.Vented F359 Hz - All international buyers are responsible for all tax, duties and/or customs fees.