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Portable Audio DAC/Amp
True Balanced Circuit with Dual Op-Amps

3.5mm and 4.4mm DualHeadphone Outputs
Offering both 3.5mm single-ended and 4.4mm balancedoutputs, the dual ports provide versatile compatibility with a widerange of professional audio equipment, enabling a more diverseexperience and expanded possibilities.

Discrete DAC lmplementation with Dual Op-Amps
Featuring the ESS9281AC PRO decoding chip paired with dual
RT6863C high-current operational amplifiers, the devicedelivers significantly increased output power, supporting PCMdecoding up to 32-bit/768kHz for lossless Hi-Fi audio and apremium listening experience.

Separation of Analog andDigital Power Domains
The circuit board features a discrete design for the power supplyand digital-to-analog sections, with dedicated optimization of theDAC, signal, and power layers to achieve uncompromising audioquality.

Small and portable design,easy to use
The device boasts a minimalist and lightweight form factor,constructed with a metal exterior, weighing only 19g for enhanced portability and enduring durability.

Two color options available/Technical Specifications
Model: ATOM 4
DAC Chip: ESS9281AC PRO *1
Op-Amp:RT6863C*2
Audio Input: USB-C
Audio Output: 3.5mm Single-ended / 4.4mm Balanced
Frequency Response:< ±0.08dB up to 40kHz
Two-Stage Amplification: Dual RT6863 Op-Amps in the FirstStage, Switching Amplifier in the Second Stage. True Balanced4.4mm Output.
3.5mm SE. Output Power:
Up to 2Vrms
4.4mm Balanced Headphone Output Power:
Maximum Qutput Voltage: Up to 4.2Vrms
≥126mW(32Q),Current DriveOutput Power: ≥137mW @ 32Q (Current Drive)≥7mW (600Ω). Voltage DriveOutput Power: ≥29mW @ 600Ω (Voltage Drive)
SNR: -119dB
THD+N: 0.0004%
Sampling Rate: up to 32-bit/768kHz
DSD support:up to DSD512
Weight: 19g
Built-in Battery: No

USB-C Plug and Play
Compatible with most USB-C devices, including phones, tablets,and computers, for high-quality audio playback. Plug and playfor seamless audio enjoyment,