Brand NEW! Including 90 Days USA Factory Warranty. Dayton Audio's compact ND65-4 aluminum cone full-range driver demonstrates the latest advances in high-excursion design processes. When teamed up with the matching ND series passive radiators this driver can produce incredible full sound from compact enclosures. Key Features Rubber-edged aluminum alloy cone Large excursion capability Self-shielded Neo-Balanced motor structure 4-layer underhung voice coil with polyimide former High power handling Dayton Audio's compact ND65-4 aluminum cone driver demonstrates the latest advances in high-excursion design processes. An efficient, low-distortion Neo-Balanced motor is combined with a rigid yet lightweight aluminum diaphragm, yielding impressive high-impact audio reproduction. Perfect for single point-source speaker applications, or combined in multiples and line arrays. Product Specifications Nominal Diameter2-1/2" Moving Mass Of Diaphragm (Mmd)2.5 Power Handling (RMS)15 Watts Power Handling (MAX)30 Watts Impedance4? Frequency Response85 to 20,000Hz Sensitivity83dB 2.83V/1m Voice Coil Diameter0.75" Thiele-Small Parameters Resonant Frequency (Fs)89.5Hz DC Resistance (Re)3.5? Voice Coil Inductance (Le)0.44mH Mechanical Q (Qms)5.56 Electromagnetic Q (Qes)0.68 Total Q (Qts)0.61 Compliance Equivalent Volume (Vas)0.03ft Mechanical Compliance of Suspension (Cms)1.26mm/N BL Product (BL)2.68T·m Maximum Linear Excursion (Xmax)3.5mm Surface Area of Cone (Sd)15.6cm Materials of Construction Cone Material - Aluminum Surround Material - Rubber Voice Coil Wire Material - Copper Voice Coil Former - Kapton / Polyimide Basket / Frame Material - Steel Magnet MaterialNeodymium Mounting Information Overall Outside Diameter 2.52" Baffle Cutout Diameter 2.05" Depth 1.89" # Mounting Holes 4 Optimum Cabinet Size (determined using BassBox 6 Pro High Fidelity suggestion) Sealed Volume 0.05ft Sealed F3 102Hz Vented Volume 0.08ft Vented F3 53Hz - All international buyers are responsible for all tax, duties and/or customs fees.