Questyle Sigma & Sigma Pro
Questyle is expanding its range of portable audio devices with two new models, Sigma and Sigma Pro. The company positions them as mobile solutions intended to deliver a level of performance closer to full-size desktop systems, aimed at users who want genuine high-fidelity playback from a computer, smartphone or tablet. Both devices are built around Questyle's proprietary Current Mode Amplification, or CMA, technology, which is designed to combine very low distortion, strong dynamic performance and substantial output power within a compact form factor.