Brand NEW! Including 90 Days USA Factory Warranty. Dayton Audio's ND105-8 compact aluminum cone midbass produces high-impact audio demonstrating 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. Dayton Audio ND105-8 4" Aluminum Cone Midbass Neo Driver 8 Ohm Dayton Audio's compact aluminum cone drivers demonstrate 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 applications, or combined in multiples and line arrays. Nominal Diameter - 4" Power Handling (RMS) - 30 Watts Power Handling (max) - 60 Watts Impedance - 8 ohms Frequency Response - 60 to 10,000 Hz Sensitivity - 82.7 dB 2.83V/1m Voice Coil Diameter - 1" Thiele-Small Parameters Resonant Frequency (Fs) - 66.6 Hz DC Resistance (Re) - 7.70 ohms Voice Coil Inductance (Le) - 1.25 mH Mechanical Q (Qms) - 5.57 Electromagnetic Q (Qes) - 0.74 Total Q (Qts) - 0.66 Compliance Equivalent Volume (Vas) - 0.104 ft. Mechanical Compliance of Suspension (Cms) - 0.84 mm/N BL Product (BL) - 5.44 Tm Diaphragm Mass Inc. Airload (Mms) - 6.80g Maximum Linear Excursion (Xmax) - 4 mm Surface Area of Cone (Sd) - 51.5 cm Materials of Construction Cone Material - Aluminum Surround Material - Rubber Voice Coil Wire Material - Copper Voice Coil Former - Kapton / Polyimide Basket / Frame Material - Steel Magnet Material - Neodymium Mounting Information Overall Outside Diameter - 4.13" Baffle Cutout Diameter - 3.66" Depth - 2.64" # Mounting Holes - 4 - All international buyers are responsible for all tax, duties and/or customs fees.