Having recently impressed us with its mid-range FiiO M11S portable digital audio player, Chinese audio firm FiiO is back with a decidedly high-end offering for its next on-the-go device.The new M15S portable player comes packed with two desktop-grade ES9038PRO digital-to-analog converters, with individual DAC chips dedicated to the left and right stereo channels.Each chip makes use of four D/A converters for what FiiO claims to be extremely high-quality decoding, with the device able to support playback of audio files
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