The X5 3rd gen is equipped with two top-of-the-line AKM AK4490EN DACs, one for each channel. By using a dual-channel implementation of AKM’s unique low-distortion architecture that includes digital filtering with 32-bit processing, the DAC chips in the X5 3rd gen have the ability to finely and exactly reproduce music. The X5 3rd gen also utilizes two separate crystal oscillators - one for the DSD/44.1/88.2/176.4/352.8 kHz sampling rates and the other for 48/96/192/384 kHz. This ensures that under all sampling rates, there is significantly reduced jitter, improved clock accuracy, more stable operation and virtually no sampling rate conversion artifacts.
The X5 3rd gen utilizes two dual-channel OPA1642 chips for its low-pass filtering stage and a custom-made audiophile-grade OPA 426 chip for amplification, providing greater power output and greater ability to deal with capacitive loads. The X5 3rd gen also features two headphone outputs. One single-ended, and the other balanced. To circumvent the problem of third-party Android apps automatically converting the sample rate of music, FiiO’s software team wrote an entire new audio software optimized for Android 5.1 OS. This helps improve sound quality, overall performance and better battery life. The X5 also features two modes of operation - Pure Music Mode and Android mode. It has 2.4 GHz Wi-Fi and Bluetooth aptX.