Review: Questyle M12 Mobile Headphone Amp With DAC Delivers On Hi-Res Lossless Audio Even premium headphones like Apple’s AirPods Max can’t play Hi-Res Lossless audio when streamed from an iPhone. Plug into the tiny Questyle M12 Mobile Headphone Amp with DAC and you can take full advantage of that Hi-Res Lossless 24-bit/192 kHz music.