Power Amplifiers

X4.2

2-Channel Class-D Power Amplifier, 400W per Channel @ 4Ω

2 × 400W at 4Ω
Stable 2Ω Operation
Stereo, Mono, and Bridge Operating Modes
Selectable 0.775V, 1.0V, and 1.44V Input Sensitivity
Universal Switch-Mode Power Supply
Switchable 75Hz low-cut filter and ground lift
Comprehensive Protection Circuitry

Where to Buy

Overview

The Sound Barrier X4.2 is a compact two-channel Class-D power amplifier designed for permanent installations, houses of worship, conference facilities, entertainment venues, distributed audio systems, and smaller mobile or rental applications. It delivers 2 × 400W at 4Ω, 2 × 200W at 8Ω, and up to 700W per channel at 2Ω, providing dependable power for full-range loudspeakers, stage monitors, and compact subwoofer systems.

Stereo, mono, and bridge operating modes allow the X4.2 to accommodate a variety of system configurations, including up to 600W bridged at 8Ω. Selectable input sensitivity, a switchable 75Hz low-cut filter, and ground-lift control provide additional flexibility when integrating the amplifier with mixers, processors, and installed audio systems.

A universal 100–240 VAC power supply with active Power Factor Correction supports reliable operation across a wide range of electrical environments. Its lightweight 1U metal chassis, internal heat sinks, dual variable-speed cooling fans, comprehensive protection circuitry, and clear front-panel status indicators make the X4.2 a compact and cost-effective amplifier for professional applications.

KEY FEATURES

2 × 400W at 4Ω
Stable 2Ω Operation
Stereo, Mono, and Bridge Operating Modes
Selectable 0.775V, 1.0V, and 1.44V Input Sensitivity
Universal Switch-Mode Power Supply
Switchable 75Hz low-cut filter and ground lift
Comprehensive Protection Circuitry

Universal Power with Active PFC

The DA Series features a universal switch-mode power supply designed to operate from 100–240 VAC ±10%, 50/60Hz, allowing reliable use across a wide range of global power systems. Active Power Factor Correction (PFC) optimizes current draw, improves power efficiency, and helps maintain consistent amplifier performance under demanding operating conditions.

3 Year Warranty

Includes a 1-year standard limited warranty, extended to 3 years total at no additional cost when the product is registered within 90 days of purchase. Proof of purchase is required. Statutory consumer rights are not affected.

Specifications

Output Power

2Ω Stereo:: 2 x 700W

4Ω Stereo:: 2 x 400W

8Ω Stereo:: 2 x 200W

8Ω Bridge:: 1 x 600W

Amplifier Specifications

Output Channels:: 2

Topology:: Class D

Operating Modes:: Stereo / Mono / Bridge

Minimum Load:: 2Ω per channel

Frequency Response:: 20Hz–20kHz, +0/−2dB at 10% rated power into 8Ω

THD+N:: Typical 0.01%

Signal-to Noise Ratio:: ≥103dB

Damping Factor:: Greater than 400 at 8Ω, 20Hz–200Hz

Crosstalk:: ≥80dB, 20Hz–1kHz

Input Impedance:: 20kΩ balanced

Input Sensitivity:: 0.775V, 1.0V, or 1.44V selectable

Input / Output Section

Input Connectors:: 2 x balanced XLR inputs

Link Output Connectors:: 2 × balanced XLR

Channel Output Connectors:: 2 × speakON-type locking connectors

Bridge Output Connectors:: 1 × speakON-type locking connectors

Controls

Front Panel:: 2 × channel-level controls and power switch

Rear Panel:: Input sensitivity, operating mode, 75Hz low-cut filter, and ground lift

Power Requirements

Operating Voltage:: 100–240 VAC ±10%, 50/60Hz

Power Supply:: Universal switch-mode power supply with active PFC

Cooling & Protection

Cooling:: Internal heat sinks and two variable-speed fans

Protection Circuits:: Short-Circuit Protection, Power-Supply Overload Protection, Over-Temperature Protection, DC Protection, Soft Start,

Status Indicators:: Signal, power, clip, and protection

Construction

Rack Space:: 1U

Dimensions (W x H x D):: 19 × 1.8 × 10.2 inches (483 × 45 × 259mm)

Net Weight:: 10.1 lb (4.6kg)

Warranty

3-Year Warranty:: 3-Year Warranty with Product Registration

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User Manuals

1.1 MB