AIYIMA H4 Portable Hi-Res USB DAC & Balanced Headphone Amplifier

Studio-Grade Audio Clarity with Advanced ES9039Q2M Decoding and Balanced Power

The AIYIMA H4 is a premium portable USB DAC and balanced headphone amplifier designed to deliver high-resolution audio tracking anywhere. Equipped with a high-performance ESS ES9039Q2M DAC chip and dual RT6863 operational amplifiers, it effortlessly drives both standard and low-impedance headphones with pristine signal integrity. Its integrated OLED display, multi-platform USB Audio Class switching, and dual output configurations make it an essential upgrade for mobile audiophiles, desktop setups, and gaming consoles.

• Flagship ESS ES9039Q2M DAC Decoding: Utilises an advanced high-end ESS conversion chip to support ultra-high resolution audio streams up to 32-bit/768kHz PCM and native DSD512 with ultra-low distortion.
• Dual RT6863 Independent Amp Architecture: Integrates two dedicated operational amplifier chips to minimize analog stage noise, ensuring a pure, natural sound floor even on sensitive monitors.
• Dual 3.5mm SE & 4.4mm Balanced Outputs: Features a 3.5mm single-ended output along with a dedicated 4.4mm balanced jack delivering up to 240mW of power to scale seamlessly into heavy planar headphones.
• Integrated OLED Display & Hardware Controls: Provides immediate visual status on sound configurations, volume steps, and audio stream formats via an elegant screen and physical button layout.
• Multi-Platform UAC Class Switching: Offers selectable USB Audio Class (UAC 1.0/2.0) modes to ensure plug-and-play driverless compatibility with Windows, macOS, Android, iOS, and gaming consoles like PS5 and Switch.
• 8 Digital PCM Filter Signatures: Features 8 built-in digital filter options allowing listeners to instantly fine-tune, switch, and customize the sound signature directly on the device hardware.

• DAC Chip: ESS ES9039Q2M
• Op-Amp Chip: 2x RT6863
• Input Port: 1x USB Type-C
• Headphone Outputs: 1x 3.5mm Single-ended (Combo S/PDIF Coaxial Support), 1x 4.4mm Balanced
• USB Audio Sampling Rates: PCM up to 32-bit / 768kHz, DSD up to DSD512 (DoP)
• S/PDIF Coaxial Sampling Rates: PCM up to 192kHz, DoP128
• 3.5mm Output Specifications: 125mW @ 32Ω, THD+N 0.00071%, SNR 122dB, Noise Floor < 1.5μVrms
• 4.4mm Balanced Specifications: 240mW @ 32Ω, THD+N 0.00056%, SNR 120dB, Noise Floor < 1.9μVrms
• Headphone Impedance Range: 16-300Ω
• Dimensions & Weight: 56mm x 23mm x 12.5mm, 22.5g (without cables)
• What's in the Box:
  • AIYIMA H4 Portable DAC & Amp Unit
  • USB Type-C to Type-C Cable
  • USB-A to Type-C Adapter
  • User Manual