Questyle M12 Portable Headphone Amplifier USB DAC, Hi-Res DAC, Low Noise,for Smartphones, PC, Laptops - 3.5mm Jack - Headphone Amps, USB DAC : Amazon.co.uk: Electronics & Photo
Questyle CMA 600i: who needs a stack of components when CMA600i does it all so well? DSD256, fantastic clarity, plenty of drive. Heck yes, I want it. – Audio Primate
6moons audioreviews: Questyle CMA800R Gold
Focal Utopia with Questyle CMA800R - Review - HiFi and Music Source
Questyle M12 Portable Headphone Amplifier USB DAC, Hi-Res DAC, Low Noise,for Smartphones, PC, Laptops - 3.5mm Jack - Headphone Amps, USB DAC : Amazon.co.uk: Electronics & Photo