Brand NEW! Including 90 Days USA Factory Warranty. Dayton Audio RST28A-4 1-1/8" Reference Series Aluminum Dome Tweeter with Truncated Faceplate The Dayton Audio RST28A-4 1-1/8" aluminum dome Reference Series tweeter has remarkable clarity, low free air resonance, exceptional efficiency, and smooth frequency response, a combination seldom found in the industry at any price. The included truncated faceplate allows for tighter spacing between the tweeter and woofer/midrange drivers. Highlights 1-1/8" aluminum diaphragm offers remarkable clarity without the typical harshness of metal domes Perfect for line arrays or mini-monitor designs Exceptional efficiency at 92.5 3 dB from 1.5 kHz to 19 kHz and a smooth frequency response Tuned rear chamber and high-quality Ferrofluid for excellent low-end response Low-distortion motor system achieves a rare level of transparency Matches the performance of even the most expensive audiophile high-frequency transducers The Dayton Audio RST28A-4 aluminum dome Reference Series tweeter offers exceptional efficiency from 1,500 Hz to 20,000 Hz with smooth and well controlled frequency response. The included truncated faceplate makes the RST28A-4 ideal for deigns like line arrays or compact mini-monitors that demand a smaller faceplate, or any situation where you want to keep center-to-center distances as small as possible. This tweeter's unique black anodized 1-1/8" aluminum diaphragm and state-of-the-art motor system not only match the look and features of Dayton Audio's Reference Series woofers and midranges, but also the clean, detailed, and uncolored sound you have come to expect. A specialized damped rear chamber, well-designed phase bridge, rigid mesh grill, and several distortion-reducing paths in the motor are just a few of the features that allow these tweeters to outperform some the most expensive audiophile high-frequency transducers. Product Specifications Tweeter Type - Metal Dome Cone / Dome Diameter - 1-1/8" Impedance - 4 ohms Power Handling (RMS) - 80 Watts Frequency Response - 1,500 to 20,000 Hz Sensitivity - 92.5 dB 2.83V/1m Thiele-Small Parameters Resonant Frequency (Fs) - 775 Hz DC Resistance (Re) - 3.0 ohms Voice Coil Inductance (Le) - 0.03 mH Mechanical Q (Qms) - 2.15 Electromagnetic Q (Qes) - 1.65 Total Q (Qts) - 0.93 Mounting Information Overall Outside Diameter - 4.125" x 3.25" Cutout Diameter - 2.875" Depth - 1.75" - All international buyers are responsible for all tax, duties and/or customs fees.