FiiO X5 High Resolution Music Player (2nd Generation)(Titanium) All new digital audio architecture: JZ4760B + SA2000 + PCM1792A + PGA2311A. Native DSD64/128 support and SACD ISOs. High gain reaches 14V (+/-7V), 40% higher than the 1st gen X5, putting the op amps in their best working range, greatly increasing dynamics. Top shelf PCM1792A from Texas Instrument coupled with new OPA1652 gives great dynamic performance The X5-II makes use of two crystal oscillators, one each for the 44.1kHz and 48kHz frequency multiples. Compared to the 1st gen X5, the new X5-II is 15% lighter and 12% smaller.