Diamond Audio DES400.4D 4-Channel Elite DES Series Full Range Class D Car Amplifier

Diamond Audio DES400.4D

The Diamond Audio DES Series 4-Channel Full Range Class D Amplifier, engineered for audiophiles who demand clean power, precision control, and dynamic performance. As part of the flagship Diamond Elite DES Series, this amplifier delivers premium sound quality, installation flexibility, and consistent power across all impedance levels.

Built with advanced Class D digital amplifier technology, the Diamond Audio 4-channel amplifier produces 170W RMS x 4 at 2 ohms and 140W RMS x 4 at 4 ohms, with the ability to bridge into 400W x 2 at 4 ohms. This versatile configuration makes it ideal for powering component speakers, coaxial speakers, or bridging channels for subwoofer applications, delivering rich, detailed sound across the full frequency range.

Engineered using the latest digital chipset and full PWM power supply, the DES Series amplifier ensures efficient operation with minimal distortion. With THD as low as 0.07% and a signal-to-noise ratio up to -97.4dBA, this amplifier delivers clean, accurate audio reproduction for high-end systems.

Fine-tune your system with variable high-pass and low-pass crossover controls (35Hz–350Hz), allowing precise tuning for optimal speaker performance and sound staging. The Diamond Audio DES amplifier also features balanced differential inputs for noise-free signal transmission and a high damping factor (>250) for improved speaker control and tighter response.

Designed for seamless integration, this full-range Class D amplifier includes multiple auto turn-on options (VOX, DC offset, and REM), ensuring compatibility with both factory and aftermarket head units. Built-in short circuit, thermal, and voltage protection ensures long-lasting durability and system safety.

Features:

• 4-Channel Full Range Class D Amplifier
• 170W x 4 @ 2Ω / 140W x 4 @ 4Ω / 400W x 2 Bridged
• Diamond Elite DES Series Flagship Performance
• Advanced Digital Chipset with Full PWM Power Supply
• Variable HPF/LPF Crossover Controls (35Hz–350Hz)
• VOX / DC / REM Auto Turn-on Options
• Balanced Differential Inputs for Clean Signal
• High Damping Factor for Precise Speaker Control
• Compact, Premium Design for Easy Installation

Specifications

4-Channel Elite DES Series Full Range Class D Amplifier

Power Rating

• RMS Power (2Ω) : 170W x 4
• RMS Power (4Ω) : 140W x 4
• Bridged (Mono 4Ω) : 400W x 2 (4Ω Only)

Power Supply

• Power Supply : Full PWM
• Power Supply Threshold : 10.0V-17.0V (DC)
• Idle Current : 0.7A

Distortion

• THD (1KHz @ 4Ω) : 0.07%
• S/N Ratio (A Weighted @ 1W) : -77.4dBA
• S/N Ratio (A Weighted @ FP) : -97.4dBA

Input Sensitivity

• Low Input Level : 0.2mV-12.0V
• High Input Level : Up to 25W RMS

Input Impedance

• Low Input Level : 22KΩ
• High Input Level : N/A

Output Stage

• Output Impedance : 0.047Ω
• Damping Factor (50Hz@4Ω) : >250
• Bandwidth (-3dB) : 10Hz-350Hz

Crossover (-12dB/Oct)

• Variable High Pass : 35Hz-350Hz
• Variable Low Pass : 35Hz-350Hz
• Variable Sub-Sonic : N/A

Fuse Rating

• ATC : 2 x 30A

Dimensions

• L x W x H : 11.81" x 7.25" x 2.0"(299.9 x 184.2 x 50.8)mm