EMB ESM4 Compression Tweeter

The EMB ESM4 is a screw-on compression tweeter designed for horn-loaded speaker systems. It handles upper-midrange and high-frequency content that conventional woofers and midrange drivers are not intended to reproduce efficiently. It is suited to replacement work in compatible PA, DJ, and custom speaker cabinets.

This is a component compression driver rather than a flush-mount automotive tweeter or a complete horn assembly. It requires a compatible threaded horn to radiate sound effectively into the listening area. The driver is intended for builders and installers replacing a failed threaded high-frequency driver or assembling a horn-based system.

The ESM4 has a listed 8-ohm impedance and a 1.2 kHz to 20 kHz frequency-response range. Its single-voice-coil configuration provides a straightforward two-terminal connection to a passive crossover or other properly configured high-pass signal path. A listed 550-watt maximum-power rating should not be treated as an RMS rating.

The driver uses a 1-3/8-inch threaded screw mount for compatible screw-on horn hardware. This mounting arrangement may suit certain horn assemblies used in systems associated with EMB, JBL, Peavey, Cerwin Vega, Gemini, BMB, Pyle-Pro, and Mr. DJ. Mechanical compatibility depends on the horn thread and throat design, not the speaker brand name alone.

Use the ESM4 as part of a complete high-frequency section with an appropriate horn, crossover network, wiring, and cabinet. A properly selected high-pass crossover is important because low-frequency energy can damage a compression driver. Confirm fitment, system impedance, crossover point, and amplifier capability before installation.

Key Features

• Compression Driver Format: Designed to mount to a compatible horn assembly.
• 550W Maximum Power: Listed for high-output system applications with proper protection.
• 8-Ohm Impedance: Fits many common passive speaker-system designs.
• 1.2 kHz–20 kHz Response: Covers upper-midrange and high-frequency reproduction.
• Single Voice Coil: Provides a simple two-terminal driver connection.
• 1-3/8-Inch Screw Mount: Attaches to compatible threaded horn hardware.

Design & Installation

The ESM4 uses a compact compression-driver layout with a threaded screw-on interface for direct attachment to a compatible horn. Published product information confirms the 8-ohm load, single voice coil, and 1-3/8-inch mounting thread. Diaphragm material, magnet type, driver dimensions, and weight are not confirmed in the available product information.

Verify that the receiving horn accepts a 1-3/8-inch screw-on driver before mounting. Observe speaker polarity and connect the driver through an appropriate high-pass crossover or protection network; do not connect it directly to a full-range amplifier output. For replacement use, match the horn thread, crossover point, and overall system design before final installation.