EMB ESM4 (ESM1) Titanium Compression Tweeter

The EMB ESM4 is a screw-on compression tweeter designed to restore or build the high-frequency section of compatible PA-style loudspeaker systems. It is intended for upper-midrange and treble reproduction rather than bass or full-range use. With an 8-ohm nominal impedance and a published 1.2 kHz to 20 kHz frequency range, it is suited to systems using a separate woofer and crossover network.

This driver is a practical option for replacing a failed threaded high-frequency driver in compatible speaker cabinets. Marketplace references associate it with select JBL, Peavey, Cerwin Vega, Gemini, EMB, BMB, Pyle-Pro, and Mr. DJ speaker applications. Those references should be treated as fitment guidance only, since thread dimensions, impedance, horn type, and crossover design can vary between speaker models.

The ESM4 has a published maximum power figure of 550 watts and uses a single voice coil configuration. Its stated frequency coverage is focused on the high-frequency portion of a sound system, helping reproduce detail, presence, and treble content when paired with an appropriate horn and low-frequency driver. A continuous RMS power rating and sensitivity specification are not published in the available product information.

A 1-3/8-inch threaded mounting connection supports installation on compatible screw-on horns. This mounting style can make it useful for repair work where the cabinet already uses a threaded compression-driver connection. Before purchasing, compare the existing driver's thread, horn throat, electrical impedance, and available clearance with the replacement requirements.

The ESM4 should be used only with a suitable high-frequency crossover or other properly configured filtering. Sending low-frequency program material directly to a compression tweeter can damage the driver. For dependable system integration, match amplifier output, crossover settings, wiring polarity, and overall speaker-system impedance to the requirements of the complete installation.

Key Features

• 550W Maximum Power: Published maximum-power handling for high-frequency speaker applications.
• 8-Ohm Impedance: Supports matching with compatible crossover networks and speaker systems.
• 1.2 kHz–20 kHz Range: Covers upper-midrange and treble-frequency reproduction.
• Compression Tweeter Design: Intended for dedicated high-frequency horn-loaded speaker sections.
• Single Voice Coil: Provides a straightforward configuration for compatible speaker wiring.
• 1-3/8-Inch Thread Mount: Fits compatible screw-on horn connections.

Design & Installation

The ESM4 uses a compact compression-tweeter format with a threaded mounting interface and single voice coil. Retail listings identify it as a titanium compression tweeter; detailed information on the diaphragm construction, magnet assembly, dimensions, and weight is not published in the available product data. Its design is intended for use with a separate horn and a properly filtered high-frequency signal.

Install the driver only on a compatible 1-3/8-inch threaded horn or mounting point. Confirm mechanical fit before installation, then observe correct polarity and connect it through a suitable high-frequency crossover network. Do not connect the driver directly to a full-range amplifier output without proper filtering, and verify compatibility with the speaker cabinet's impedance and crossover arrangement.