Diamond Audio HX400.2 HEX Series 2-Channel Full Range Class D Car Amplifier

Diamond Audio HX400.2

The Diamond Audio HX400.2 HEX Series 2-Channel Full Range Class D Amplifier, designed for audiophiles who demand clean power, dynamic response, and superior sound clarity. Built with premium components and advanced engineering, this 2-channel car audio amplifier delivers high-end performance for component speakers, coaxial speakers, and subwoofer applications.

Powered by full-range Class D amplifier technology, the Diamond Audio HX400.2 amplifier provides outstanding efficiency while minimizing heat and maximizing output. With 200W x 2 at 4 ohms, 350W x 2 at 2 ohms, and 700W x 1 bridged at 4 ohms, this high power 2-channel amplifier offers the flexibility to power full-range speakers or bridge channels for increased subwoofer performance.

Engineered for accuracy, the HX400.2 HEX Series amplifier features a 4-layer PCB board with balanced differential inputs, ensuring noise-free signal transmission and exceptional audio clarity. Audiophile-grade components, including high-tolerance circuitry and SNAP capacitors, contribute to precise sound reproduction and reliable long-term performance.

The Diamond Audio HX400.2 Class D amplifier includes fully variable high-pass and low-pass crossovers (40Hz–400Hz) with a 24dB per octave slope, allowing precise tuning for optimal system performance. Additional features such as output clip indicators, phase control, and top-mounted controls make system setup simple and accurate.

Built with a durable anodized extruded aluminum heat sink, this compact amplifier offers superior thermal management while maintaining a sleek and modern design. The fully concealed mounting and illuminated logo add a premium aesthetic to any installation.

Features

• 2-Channel Full Range Class D Amplifier
• 200W x 2 @ 4Ω / 350W x 2 @ 2Ω / 700W x 1 Bridged
• Audiophile-Grade Components and High-Tolerance Design
• 4-Layer PCB with Balanced Differential Inputs
• Variable HPF / LPF Crossovers (24dB Slope)
• Output Clip Indicators and Phase Control for Precise Set Up
• Anodized Aluminum Heat Sink for Cooling Efficiency
• Compact Design with Premium Aesthetics
• Full Range Class D IR Chipset
• "SNAP" Capacitors used Throughout the Circuit
• Audiophile Grade High Tolerance Components
• Spring Steel FET Clips Provide a Cleaner Board Design
• Illuminated Logo / Fully Concealed Mounting
• Fine Tuned Fully Variable Crossovers and Phase Control
• Top Mounted Controls for Convenient Amplifier Adjustment

Specifications

2-Channel HEX Series Full Range Class D Car Amplifier

Power Rating

• Total RMS Power : 400 Watt
• RMS Power (2Ω) : 350 Watt X 2 Channel
• RMS Power (4Ω) : 200 Watt X 2 Channel
• Bridged (Mono 4Ω) : 700 Watt X 1 Channel

Power Supply

• Power Supply : Full PWM
• Power Supply Threshold : 10.0VDC - 17.0VDC
• Idle Current: 0.7A

Distortion

• THD 4 (1KHz @ 4Ω) : 0.06%
• S/N Ratio (A Weighted @ 1W) : -80dBA
• S/N Ratio (A Weighted @ FP) : -95dBA

Input Sensitivity

• Low Input Level : 200mV - 5.0V
• High Input Level : N/A

Input Impedance

• Low Input Level : 20KΩ
• High Input Level : N/A

Output Stage

• Output Impedance : 0.011Ω
• Damping Factor (50Hz @ 4Ω) : >250
• Bandwidth (-3dB) : 10Hz-35KHz

Crossover (-24dB/Oct)

• Variable High-Pass : 40Hz - 400Hz
• Variable Low-Pass : 40Hz - 400Hz
• Variable Sub-Sonic : N/A

Fuse Ratings

• ATC : 25A x 2

Dimensions

• L x W x H : 8.75" x 6.8" x 2.0" (222 x 195 x 51.5)mm