Questyle SIGMA: Portable Headphone Amplifier DAC with Current Mode

Questyle SIGMA, a portable DAC/headphone amplifier, integrates cutting-edge technologies for superior audio quality in a compact design.

Equipped with AKM AK4493 DAC chip, SIGMA supports PCM decoding up to 32-bit/768kHz and native DSD up to DSD512.

Features a symmetrical current-mode amplifier architecture with four modules, offering improved linearity and reduced distortion.