Aune M2 32BIT DSD portable music player M2 is the 2nd generation portable music player from Aune, co-designed by the M1, B1, S18 team. 2.4'' IPS display Full Aluminium Chassis AKM AK4490 32bit flagship DAC chip 4 Digital filter options Class A discrete transistor headphone amp integrating elements from B1 (co-designed by B1 team). Gain adjustable for headphones and earphones PGA2311 Analog Volume control Over 3.1VRMS output SNR: -116dB HO THD+N- 0.001% (Loaded) HO noise: 5.86uV (and at near max volume @3.1VRMS noise barely changes @6.08uV!) LO THD+N- 0.001% LO noise: 2.76uV 3200mAh battery Battery life 9 hours of continuous playback. Dual ultra-low jitter crystal oscillators (44khz, 48khz-192khz, DSD) Asynchronous clock and CPLD technology Micro-SD card support 128GB Dimensions: 65*110*17 (mm). Supported formats- WAV:16bit|24bit|32BIT- 44.1K/48K/88.2K/96K/176.4K/192K WAV + CUE FLAC:16bit|24bit- 44.1K/48K/88.2K/96K/176.4K/192K APE:16BIT/44.1K APE + CUE DSD formatSF/DSD64 - DFF/DSD64 ISO AAC, MP4A, MP3 There are 3 models of M2: -Aune M2- $350- Uses Japanese Crystal Oscillators -Aune M2 Pro-$500- Uses custom Crystek (USA) Crystal Oscillators pictured below and opamps upgraded. -Aune M2S- $650- Has the upgrades of the Pro version and adds Teflon substrate PCB, this is the only dap to use Teflon PCB which are only found in a few very expensive desktop audio gears.