Brand NEW! Including 90 Days USA Factory Warranty. PRV Audio's impressive 4MR60-4 4 ohm 4" full range driver is excellent for use in portable speaker systems, line arrays, or even car audio applications. With 91 dB efficiency and 30 watt power handling this driver is capable of remarkable output for its size. Highlights Inherently damped, woven fiberglass cone Large spider improves linearity at high excursion Rubber surround for use in less than optimum conditions High efficiency and power handling allows surprising output for its size The 4MR60-4 from PRV Audio can deliver amazingly flat response from 150 Hz up to 7,000 Hz. With a woven cone and rubber surround, this driver is inherently damped minimizing resonant peaks to produce a more natural sound. Capable of high output for its size, this full range is perfect for use in small portable speakers, larger line arrays, or even car audio systems. Product Specifications Nominal Diameter - 4" Power Handling (RMS) - 30 Watts Power Handling (max) - 60 Watts Impedance - 4 ohms Frequency Response - 90 to 15,000 Hz Sensitivity - 90 dB 2.83V/1m Voice Coil Diameter - 0.78" Thiele-Small Parameters Resonant Frequency (Fs) - 89.88 Hz DC Resistance (Re) - 3.6 ohms Voice Coil Inductance (Le) - 0.20 mH Mechanical Q (Qms) - 7.34 Electromagnetic Q (Qes) - 0.75 Total Q (Qts) - 0.68 Compliance Equivalent Volume (Vas) - 0.12 ft. Mechanical Compliance of Suspension (Cms) - 0.725 mm/N BL Product (BL) - 3.42 Tm Diaphragm Mass Inc. Airload (Mms) - 4.32g Maximum Linear Excursion (Xmax) - 2.87 mm Surface Area of Cone (Sd) - 57 cm Materials of Construction Cone Material - Fiberglass Surround Material - Rubber Voice Coil Wire Material - CCA Voice Coil Former - Kapton / Polyimide Basket / Frame Material - Steel Magnet Material - Ferrite Mounting Information Overall Outside Diameter - 4.134", Diagonally (across screw holes): 4.96" Baffle Cutout Diameter - 4.02" Depth - 2.20" Bolt Circle Diameter - 4.528" # Mounting Holes - 4 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume - 0.33 ft. Sealed F3 - 105 Hz Vented Volume - 0.37 ft. Vented F3 - 50 Hz - All international buyers are responsible for all tax, duties and/or customs fees.