Brand NEW! Including 90 Days USA Factory Warranty. The Dayton Audio compact NHP25F-4 1" soft dome tweeter uses a high temperature neodymium motor, Ferrofluid cooling, and rear mounted heat sink for improved heat dissipation making this tweeter suitable for higher output systems and even professional line arrays. In addition, the flat response and high efficiency makes the NHP25F-4 an amazing value. Key Features Attached heat sink and ferrofluid cooling for increased power handling Over 95 dB efficient is perfect for use in higher output designs Compact cast aluminum faceplate minimizes center to center distance High temperature neodymium motor allows high output for extended periods Extremely smooth response makes for easy transition to midrange diver Dayton Audio's versatile NHP25F-4 is a 1" soft dome tweeter that offers the performance of more expensive tweeters in a compact and stylish package. The small yet powerful high temperature neodymium motor with attached aluminum heat sink and Ferrofluid-filled magnetic gap reduces power compression and improves long-term power handling. In addition, the carefully designed silk diaphragm provides natural treble response up to 20 kHz, excellent off-axis dispersion, and superb sonic detail. The NHP25F-4 includes a 2.5" cast aluminum faceplate, however Dayton Audio does offer an optional 4.09" (104 mm) and 4.33" (110 mm) faceplate allowing this tweeter to be used as a drop in replace for many common sized tweeters. Product Details Brand Dayton Audio Model NHP25F-4 Part Number 275-108 UPC 848791004759 Unit of Measure Each Weight 0.25 Product Specifications Cone / Dome Diameter 1" Cutout Diameter 1.58 Tweeter Type Soft Dome Power Handling (RMS) 40 Watts Impedance 4? Frequency Response 3,000 to 20,000Hz Sensitivity 95dB 2.83V/1m Thiele-Small Parameters Resonant Frequency (Fs) 1689Hz DC Resistance (Re) 3.18? Voice Coil Inductance (Le) 0.03mH Mechanical Q (Qms) 3.75 Electromagnetic Q (Qes) 2.04 Total Q (Qts) 1.32 Mounting Information Overall Outside Diameter 2.51" Depth 0.71" - All international buyers are responsible for all tax, duties and/or customs fees.