Rebec ES4S 4-Channel Class AB Amplifier

Product Overview

The Rebec ES4S is a flagship 4-channel Class AB amplifier from the Rebec Legend Series. Developed as one of the highest-level amplifiers in the Rebec lineup, the ES4S combines multi-channel flexibility with the refinement and musical performance expected from a high-end amplifier platform.

Delivering 150W RMS per channel at 4Ω and 300W RMS per channel at 2Ω, the ES4S is designed to provide substantial power reserves while maintaining the sonic characteristics that define the Legend Series. Its four-channel architecture allows it to support a wide variety of system configurations without sacrificing sound quality or musical detail.

As part of Rebec’s flagship amplifier range, the ES4S focuses on tonal accuracy, dynamic stability, and the faithful reproduction of musical information.

The Legend Series Philosophy

The Legend Series represents the highest tier of Rebec amplifier development. Products within this series are engineered with a strong emphasis on musical reproduction, signal integrity, and long-term listening enjoyment.

The ES4S reflects this philosophy through a Class AB design that prioritizes tonal naturalness and musical coherence while maintaining the output capability required for demanding car audio systems.

Rather than concentrating solely on power figures, the amplifier is designed to reproduce music with balance, detail, and consistency across different listening conditions.

Key Features

• Legend Series flagship amplifier

• Class AB amplifier design

• 150W × 4 RMS @ 4Ω

• 300W × 4 RMS @ 2Ω

• 450W × 2 bridged output @ 4Ω

• 600W × 2 bridged output @ 2Ω

• Frequency response from 20Hz to 35kHz

• Signal-to-noise ratio ≥99dB

• THD+N ≤0.01% (1kHz)

• Power transistor output stage

• Four-channel architecture for flexible system integration

Design and Engineering

The ES4S utilizes a Class AB amplifier circuit combined with a power transistor output stage. This architecture is designed to provide stable amplification while preserving signal accuracy and minimizing distortion.

The amplifier accepts low-level input signals from 0.63V to 11V and operates within a voltage range of 10V to 16V. These specifications allow integration with a wide range of source units and digital signal processors.

A signal-to-noise ratio of at least 99dB and THD+N below 0.01% support clean signal amplification throughout the audio spectrum. The amplifier’s frequency response extends from 20Hz to 35kHz, ensuring consistent performance across a broad frequency range.

Sharing the same substantial chassis dimensions as the ES2S, the ES4S is built to support its flagship position within the Legend Series.

Power and System Flexibility

One of the defining characteristics of the ES4S is its combination of multi-channel capability and substantial output power.

With four independent channels delivering 150W RMS each at 4Ω, the amplifier can support complex audio systems while maintaining consistent output across all channels.

When additional output is required, the ES4S can be bridged to provide up to 450W × 2 at 4Ω or 600W × 2 at 2Ω. This flexibility allows the amplifier to adapt to a wide variety of system architectures while preserving the sonic characteristics of the Legend Series.

Compared with the ES2S, the ES4S provides two additional amplifier channels, offering greater installation flexibility while maintaining the same high-end platform.

Sound Performance

The ES4S is characterized by an exquisite and natural timbre combined with a rich and delicate presentation.

Its sound signature focuses on preserving tonal accuracy and musical texture, allowing instruments and vocals to be reproduced with a natural sense of balance. Fine musical details remain intact, while the overall presentation retains coherence and refinement.

Another defining characteristic of the ES4S is its stability during large dynamic transitions. As musical intensity increases, the amplifier is designed to maintain composure and preserve the structure of the performance without losing detail or tonal consistency.

The combination of natural timbre, delicate detail reproduction, and dynamic stability contributes to a presentation that remains engaging across a wide range of musical styles.

Product Positioning

Within the Rebec amplifier lineup, the ES4S serves as a flagship four-channel amplifier in the Legend Series.

Compared with the ES2S, it provides additional amplifier channels and greater system flexibility, while maintaining the high-end design philosophy of the series. Although its per-channel power output is lower than the ES2S, the ES4S offers a broader range of installation possibilities through its four-channel architecture.

It is designed for listeners seeking a high-end Class AB amplifier that combines multi-channel versatility with natural timbre, rich musical detail, and stable dynamic performance.

Design Philosophy

The ES4S was developed to reproduce music with natural tonality, fine detail, and consistent dynamic behavior. Its purpose is not simply to provide additional amplifier channels, but to preserve the integrity of musical information while supporting more complex system configurations.

By combining a flagship Class AB platform with four-channel flexibility, the ES4S reflects Rebec’s commitment to accurate and engaging music reproduction.

Rebec ES4S

Flagship Four-Channel Design. Natural Timbre. Stable Dynamic Performance.