The X5 (2nd Gen) from Fiio is a portable high-resolution audio player and USB DAC for audio enthusiasts. The unit features an audiophile-grade architecture and premium components capable of playing files up to 24-bit/192 kHz in a variety of formats including native DSD, WAV, WMA, ALAC, FLAC, APE, AIFF, and more.
The X5-II utilizes a Texas Instruments PCM1792A DAC coupled to an OPA1652 for great dynamic performance, while the FET inputs for I/V conversion offer extra-low distortion and noise. Additionally, two top-flight OPA1612 chips provide low pass filtering and voltage amplification for extra-low distortion and noise. The headphone output employs two BUF634U chips for current buffering, resulting in a sufficient drive current for a wide sound stage, high dynamics, and good bass power. Dual crystal oscillators ensure the lowest jitter and highest precision playback of music at any sample rate, eliminating conversion artifacts.
The player offers a standard 1/8" / 3.5mm headphone output and a separate line out/digital (coaxial) out via 1/8" / 3.5mm. The X5-II has no on-board memory, but uses two microSD card slots supporting up to 256GB total. The 3300mAh Li-polymer battery provides up to 10 hours of playback under normal conditions. The user interface offers five unique themes, while the classic scroll wheel and 2.4" HD IPS color display offers easy navigation. You can browse and play songs via folders, songs, albums, artists, genres, favorites, and playlists. The 10-band graphic EQ and the 120-step digital volume control allow for custom-tailored sound and levels.
The X5-II is 15% lighter and 12% smaller than the original X5. The chassis is made of aluminum alloy and features a high-reflectance, fine-grain faceplate. The X5-II ships with a 3' / 1m high-current Micro-USB data/charging cable, an 1/8" / 3.5mm coaxial S/PDIF adapter, a black silicone case, three screen protectors (1 applied in-factory), an HDtracks coupon, and a set of three Bodywork stickers (USA flag, wood grain, and carbon fiber).
Play Mode: Sequential, Shuffle, Loop Single, Loop All
Resume After Power Off: Can resume from last song or last position before power off
Hibernation: Player can automatically enter hibernation for instant wake-up / playback with minimal battery drain
Screen Saver: Custom defined screen timeout time
CUE Sheet Supported: Supports splitting songs by CUE sheets and skipping though tracks within cue sheet
Themes: 5 different built-in themes
Playback Display: Supporting embedded / external / folder-based album art, lyrics and ID3 display
Gapless playback supported
Volume Control: 120 steps digital potentiometer
Output Protection: Power supply safety control over analog circuit
Gain Setting: Switchable between high and low gain
Equalizer: 10-band EQ (±6 dB)
Hearing Protection: Customizable max volume setting to protect hearing
Balance: Max bias 10 dB L/R (1 dB increments)
On / Off Transients: Output relay prevents on / off transients
Headphone Detection: Playback pauses on headphone disconnection
Internal Battery: 3300mAh 3.7V Li-polymer
Playtime: >10 hours (32 ohms; normal volume with display off)
Firmware upgrade via microSD card (formatted in FAT32)
Data Transfer: Micro-USB 2.0 high speed