FiiO X3 Portable Music Player

The player uses Wolfson WM8740 digital converter which is a "true audiophile-grade", according to CNET. The unit has a 2.4-inch TFT LCD display, 3100mAH lithium polymer battery for 10 hours play time and offers two 3.5mm analog stereo outputs, as well as 3.5mm coaxial digital outputs. It comes with 8GB of internal storage and includes an expansion slot for microSD cards for capacities of up to 128GB. It is enclosed in a black solid metal case and has nearly the same size as an iPod Classic.[3] It comes with USB cable, coaxial adaptor, silicone case and screen protectors. It is being charged via micro USB.[4]

The player is capable of playing MP3 files as well as supports major formats such as FLAC, WAV, WMA, Monkey's Audio (APE), AAC, Ogg Vorbis and ALAC. The X3II also supports native dac. It is also possible to connect the player to a PC with Windows, Mac, Linux OSes and devices that offer USB On-the-go in order to function as USB DAC. FiiO X3 can drive both low- and high-impedance headphones: from 16 to 300 ohms. The player offers gapless playback, hardware (non DSP) bass and treble controls.[2] It has a simple UI with a generic file browser. FiiO X3 will work with most major library managers such as Media Monkey, Windows own Media Player and Winamp.

LA Times wrote that sound quality the player produces has never been available at anything close to this price on any kind of player, including portable players.[5]

CNET wrote that high-resolution music 96 kHz and 192 kHz/24 FLAC sounded remarkable. "Bass definition firmed up, and after I spent a few hours with the X3 the iPod sounded rather bland and boring." The sound on X3 was "more complete and realistic" than that of iPod and "it's a much better sounding player [than iPod classic]".[3]

Headfonics commented about the sound presentation: "is a nice warm laid back tonality with next to no background noise or hiss for sensitive earphones, a well defined mid section, good tight bass without being too dominant (you can EQ that if you wish) and a slightly rolled off treble." The reviewer noted a hiss-free background.[4]

Hi-Fi World noted that FiiO X3 can potentially deliver better sound quality than any CD, as well as far better sound than portables like the iPod. According to their measurements that were performed at 3V through the headphone socket at high gain the X3 had "50% more output than most CD players, and ten times more output than most portables." However, it was noted that music sounded better via external amplifier such as Audiolab Q-DAC comparing to internal amplifier of the X3. The magazine commented about playing hi-res music files: "conveys the intrinsic quality of high resolution digital audio files well."[6]

LA Times' music critic Mark Swed wrote in an article named "New audio player Fiio X3 tops the iPod, and is cheaper too" that it is a better alternative to an iPod and that X3 utilizes that same digital-to-analog converter that is found in much more expensive players, such as Astell & Kern models that are being sold for $699 and $1,299. In his opinion the FiiO X3 may not have A&K’s sweet and open sound, but it cost $200 as of April, 2013. However, he noted that the X3 is "thicker and clunkier" than an iPod Touch.[5]

Steve Guttenberg of CNET in his article "FiiO's nifty $200 portable high-resolution music player is a knockout" wrote that it sounds sweet with MP3s and it is "192kHz/24-bit awesome music player". In his opinion the X3 "smashed the price barrier". He commented: "the FiiO X3 is the one to get if you, like me, have been waiting for a music player to take your sound to the next level." He noted however, that X3 can't match the Classic's 160GB storage capability, as it offers only 8GB of memory, though it can be expanded with a memory card.[3][7]

The Gadgeteer's Bill Henderson wrote that X3 supports more music formats and higher resolutions than iPod. However, he noted that "The front face of the X3 is a confusing array of buttons." and the screen's resolution is low, although readable. He noted, that periodically, FiiO releases software updates for the X3 that improve its various aspects. As such, he mentioned that memory cards up to 128GB are being supported.[8]

Headfonics noted that the player offers good quality to price ratio.[4]

In April 2015, FiiO released an updated version of the X3 (X3II). It was revealed at CES 2015. Review samples were sent out as X3K, but upon release the name was changed. Apart from a radically updated casing and interface, reminiscent of FiiO X1, it adds hardware DSD support and a better DAC (Cirrus CS4398) for a comparable price.[9] The second generation's design also incorporates dual crystal oscillators in order to ensure precise, artifact-free sound reproduction.

The FiiO X3 Mark III has a redesigned case and button layout and supports Bluetooth and a balanced output.[10]