Hertz ML280-3 1.38" Tetolon Dome Tweeters

The Hertz ML280-3 is a pair of Mille Legend Series component tweeters designed to reproduce the upper-frequency detail that factory speakers and basic component systems can miss. Its 35 mm (1.38 in.) Tetolon fiber dome is intended for systems where clarity, extension, and controlled dispersion are important. With a 4-ohm nominal impedance, these tweeters are suited to properly designed aftermarket car-audio installations.

This model is for listeners building or refining a premium front stage with separate midrange or woofer drivers. Its 1 kHz to 28 kHz frequency-response specification and 92 dB sensitivity support detailed treble reproduction when paired with an appropriate crossover network. The low 900 Hz resonant frequency also gives installers flexibility when designing the high-pass crossover point.

Hertz uses a neodymium motor optimized through FEA magnetic-flux simulations to support transient control. An extremely pure copper short-circuit ring is incorporated to support high-frequency extension. The 28 mm voice coil and 28 mm effective radiating diameter complement the compact dome design.

The ML280-3 uses a Tetolon fiber dome geometry developed to reduce distortion and improve high-frequency dispersion. Its die-cast aluminum faceplate is profiled to support frequency response and off-axis performance. The frame structure and rear acoustic chamber are derived from CNC-machined solid aluminum for a mechanically rigid assembly.

For a complete system, these tweeters should be matched with compatible midbass or midrange drivers, amplification, and a correctly configured passive or active crossover. Hertz specifies its 180-watt peak handling with a high-pass filter at 1.8 kHz and 12 dB per octave. This makes the ML280-3 a focused component for a custom system rather than a direct full-range speaker replacement.

Key Features

• 35 mm Tetolon Dome: Produces extended high-frequency output with a compact 1.38-inch diaphragm.
• Neodymium Motor: Provides a compact magnetic structure for responsive operation.
• 900 Hz Resonance: Supports flexibility when setting an appropriate high-pass crossover.
• Copper Short-Circuit Ring: Helps support clean extension into the upper-frequency range.
• Aluminum Faceplate: Uses a profiled die-cast design intended to improve dispersion.
• Rigid Rear Chamber: CNC-machined aluminum construction helps control unwanted mechanical resonance.

Design & Installation

The tweeter combines a Tetolon fiber dome, neodymium magnet, die-cast aluminum faceplate, and a CNC-machined aluminum frame and rear chamber. Hertz also specifies high-density damping beneath the dome and low-density absorbing material in the rear chamber. These construction elements are designed to manage resonance and support smooth acoustic output.

Plan installation around the published 53.4 mm outer dimension, 29 mm mounting dimension, and 13.5 mm depth dimension. Use a high-pass crossover at or above the manufacturer’s stated 1.8 kHz, 12 dB-per-octave power-handling condition. For best system integration, mount the pair symmetrically and match them with 4-ohm compatible amplification and complementary midrange or midbass drivers.