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” Acoustic Research doesn’t include lossily-compressed MP3 or AAC files in the list of formats the AR-M2 will play. However, it did play a 256kbps AAC file of Nat King Cole singing “Nature Boy” (Capitol), which I’d bought from iTunes, as well as a 256kbps MP3 file of “Bullet with Butterfly Wings,” from Smashing Pumpkins’ (Rotten Apples) Greatest Hits (Virgin), purchased from Amazon. Also, AR lists DXD files under the formats supported, which are sampled at 352.8kHz. I don’t have any DXD files, but playing a WAV file of a 1kHz tone sampled at 384kHz resulted in pink noise.”

Acoustic Research M2 Hi-Res Portable Music Player – 24/192 DACs plus DSD. High power headphone amp and much more