Questyle SIGMA Pro Portable DAC and Professional Headphone Amplifier
By HiFi Editorial11 January 2026
Key Highlights
The Questyle Sigma Pro is a portable DAC and headphone amplifier featuring dual ES9069 DAC chips from ESS Technology for high-resolution audio decoding.
It incorporates Questyle's proprietary Current Mode amplification with four discrete stages, ensuring ultra-low distortion and compatibility with various headphone impedances.
The device supports PCM, DSD, and MQA decoding via an XMOS XU316 processor, including MQA-CD, making it suitable for studio monitoring.