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Diamond Audio

Diamond Audio 2-Channel DES Series Full Range Class D Amplifier - DES400.2D

Diamond Audio 2-Channel DES Series Full Range Class D Amplifier - DES400.2D

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Diamond Audio 2-Channel DES Series Full Range Class D Amplifier - DES400.2D

Experience flagship-level performance with the Diamond Audio DES Series 2-Channel Full Range Class D Amplifier, engineered to deliver clean power, precision control, and dynamic sound quality for high-end car audio systems. As part of the Diamond Elite DES amplifier lineup, this model is designed with a compact footprint while maintaining powerful output across all impedance levels.

Powered by advanced Class D digital amplifier technology, the Diamond Audio 2-channel amplifier delivers 250W RMS x 2 at 2 ohms and 200W RMS x 2 at 4 ohms, with the ability to bridge into 500W x 1 at 4 ohms. This flexible configuration allows it to power component speakers, coaxial speakers, or subwoofers, making it ideal for both system upgrades and custom builds.

Engineered with the latest digital chipset technology and full PWM power supply, the DES Series amplifier provides efficient performance with minimal distortion and exceptional clarity. With a signal-to-noise ratio of up to -98.9dBA and THD as low as 0.05%, this amplifier ensures clean, accurate sound reproduction across the full frequency range.

Fine-tune your system with variable high-pass and low-pass crossover controls (35Hz–350Hz), allowing precise adjustment for optimal speaker performance. The Diamond Audio DES amplifier also features multiple auto turn-on options (VOX, DC offset, and REM), ensuring seamless integration with factory and aftermarket head units.

Built for performance and installation flexibility, this full-range Class D amplifier offers balanced differential inputs for noise-free signal transmission and a high damping factor (>250) for improved speaker control and tighter bass response.

The Diamond Audio DES Series 2-Channel Amplifier delivers powerful, refined, and distortion-free sound, making it the perfect choice for premium car audio systems seeking superior performance and control.

Features

• 2-channel full range Class D amplifier
• 250W x 2 @ 2Ī© / 200W x 2 @ 4Ī© / 500W x 1 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

What our Experts Think Ā 
  • Compact amplifier, serious performance – The DES400.2D delivers 200W RMS x 2 @ 4Ī©, 250W RMS x 2 @ 2Ī©, or 500W bridged @ 4Ī©, making it ideal for powering component speakers, coaxials, or a single subwoofer.
  • Efficient Class D technology – Advanced Class D circuitry with a full PWM power supply provides clean, powerful output while minimizing heat and current draw for reliable everyday performance.
  • Precision audio tuning – Features variable high-pass and low-pass crossovers (35–350Hz), balanced differential inputs, and multiple auto turn-on options for seamless integration with factory or aftermarket head units.
  • Premium build quality – A 4-layer PCB, compact chassis, and high damping factor ensure low distortion, excellent speaker control, and long-term durability.
  • Excellent for custom upgrades – A versatile 2-channel amplifier that combines high output, flexible installation, and refined sound quality, making it a great choice for premium car audio systems.

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Q&A Ā 

Q: What is the Diamond Audio DES400.2D designed for?
A: It is a 2-channel full-range Class D amplifier designed to power speakers with clean, efficient audio performance.

Q: What are the benefits of Class D technology?
A: Class D operation delivers high power output with excellent efficiency, reduced heat, and a compact footprint.

Q: Can this amplifier power a pair of speakers?
A: Yes. Its 2-channel design is ideal for driving front or rear speakers in car, truck, or powersports audio systems.

Q: Does it include adjustable sound controls?
A: Yes. It features adjustable gain and crossover controls for optimized system tuning and sound quality.

Q: Is the DES400.2D suitable for aftermarket audio upgrades?
A: Yes. Its compact design and full-range performance make it an excellent choice for upgrading factory or custom audio systems.

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Maintenance Tips Ā  Ā 
  • Clean the amplifier with a soft, dry microfiber cloth to remove dust and debris.
  • Keep cooling fins and ventilation areas clear for proper heat dissipation.
  • Inspect power, ground, RCA, and speaker connections regularly for tight, corrosion-free contacts.
  • Ensure the amplifier is securely mounted to minimize vibration and movement.
  • Set gain correctly and avoid prolonged clipping or distortion to protect the amplifier and speakers.
  • Check the fuse and wiring periodically for signs of wear or damage.
  • Keep the amplifier dry and protected from excessive heat and moisture.
  • Re-tighten terminal screws during routine maintenance to ensure reliable performance