HIFIMAN EF400 – R2R DAC & High-Power Headphone Amplifier

Key Features

• Advanced HIMALAYA R2R DAC module for natural, detailed sound
• Powerful output: 4.4W per channel
• Fully balanced four-channel differential architecture
• High current amplifier circuit for demanding headphones
• Multiple gain modes (NOS/OS) for sound customization
• High signal-to-noise ratio (118dB)
• Premium toroidal transformer with large capacitor bank
• Compact desktop design with versatile connectivity

Next-Generation R2R DAC Performance

The HIFIMAN EF400 is a modern desktop DAC/amplifier that combines powerful amplification with cutting-edge R2R DAC technology.

Powered by the HIMALAYA R2R DAC, it delivers:

• Natural, analog-like sound
• Exceptional detail and clarity
• Smooth, non-fatiguing listening

Experience the rare performance of true ladder DAC architecture.

Fully Balanced Architecture – Pure Signal Integrity

The EF400 features a four-channel fully differential design, including:

• DAC
• Buffer
• Active filter

This ensures:

• Balanced signal output
• Reduced noise and distortion
• Superior channel separation

High Power Output – Drive Any Headphone

With strong output capabilities, the EF400 easily powers a wide range of headphones.

Output Power

• 4.4W per channel

Delivering:

• Deep, controlled bass
• Dynamic and impactful sound
• Excellent control for planar magnetic headphones

Premium Power Supply – Clean & Stable Performance

The EF400 includes:

• Oxygen-free copper toroidal transformer
• Large 30,000µF capacitor bank
• High current amplifier circuit

Providing:

• Stable power delivery
• Fast transient response
• Clean, distortion-free sound

Flexible Sound Modes – Customize Your Experience

Choose from four listening modes:

• High Gain NOS
• High Gain OS
• Low Gain OS
• Low Gain NOS

Tailor the sound to your preference and setup.

Versatile Connectivity Options

Headphone Outputs

• 4.4mm balanced
• 4-pin XLR balanced
• 6.35mm single-ended
• 3.5mm single-ended

Inputs

• USB-C
• USB-B

Outputs

• RCA (single-ended)
• Balanced line output

Reference-Level Audio Performance

• Signal-to-Noise Ratio: 118dB
• THD+N: 0.002% – 0.004%
• Channel Separation: 125±3dB

Enjoy clean, detailed, and highly accurate sound.

Compact & Stylish Desktop Design

• Dimensions: 246.5 × 228 × 61 mm
• Weight: 3.08kg
• Sleek, modern chassis

Designed to fit perfectly into any desktop audio setup.

Experience High-End Sound at Exceptional Value

The HIFIMAN EF400 delivers powerful amplification, advanced R2R DAC technology, and balanced performance in one compact unit.