The FiiO M25 is a flagship-class portable music player for listeners who want a desktop-grade DAC and headphone amplifier in a device that fits in one hand. It plays hi-res files from its own storage or a microSD card, streams from Android apps over Wi-Fi, works as a USB DAC for a computer or phone, and drives demanding headphones from either its 3.5mm or 4.4mm balanced output. It sits alongside FiiO's larger desktop-oriented M27, sharing that player's QCS6490 processor and high-capacity FPGA, and is offered in two versions with different DACs: this is the M25 VERITA with AKM delta-sigma DACs, while the separately listed M25 R2R uses FiiO's own resistor-ladder design. Both come in Black or Silver; this listing is the Silver finish.
AKM flagship DAC architecture
The VERITA version pairs an AK4191EQ modulator with two AK4499EX DAC chips, one per channel, in a fully differential audio path. Engineered to desktop-class standards, the fully differential layout reduces digital interference and channel crosstalk for accurate reproduction, open dynamics and clear layering. FiiO describes the resulting character as modern and dynamic, and for the first time the player includes four exclusive AKM sound modes. Native decoding runs to 768kHz/32-bit PCM and DSD512, with full MQA decoding and an ALL TO DSD option. A sixth-generation Digital Audio Purification System uses the same high-capacity FPGA found in the M27 together with custom femtosecond crystal oscillators to keep jitter low.
Power to drive full-size headphones
A super high gain mode, available when a fast charger is connected, delivers up to 1700mW per channel into 32 ohms from the 4.4mm balanced output, with 1000mW per channel on high gain from the battery alone. The single-ended 3.5mm output provides up to 500mW per channel into 32 ohms. Output impedance is below 0.6 ohms single-ended and below 0.9 ohms balanced, and the recommended headphone range is 8 to 350 ohms on either output. Multi-stage power purification and separate power-supply zones for the audio circuitry keep the noise floor low; FiiO quotes a signal-to-noise ratio of at least 128dB from the balanced output.
Smooth Android performance
The M25 runs on the Qualcomm QCS6490, an eight-core platform sharing the Snapdragon 778G architecture with a high-performance core running at up to 2.7GHz, backed by 8GB of RAM and 128GB of storage (around 112GB available to the user). Streaming apps, large libraries and background tasks stay responsive, and the microSD slot accepts cards up to 2TB. The 5.5-inch fully laminated 1080 x 2160 display is sized to show plenty of information while keeping the player comfortable to hold and operate one-handed. Five working modes are available: Android, Pure Music, AirPlay, USB DAC and Bluetooth receiving.
Connectivity
Dual-band Wi-Fi supports AirPlay and Wi-Fi music transfer, and Bluetooth 5.2 transmits in SBC, aptX, aptX HD, aptX Adaptive, LDAC and LHDC, or receives in SBC and LDAC so the M25 can act as a Bluetooth DAC for a phone. The 3.5mm socket doubles as a line output and coaxial digital output, and the 4.4mm socket doubles as a balanced line output, so the player can feed a hi-fi system directly. An independent XMOS XU316 USB audio processor handles USB DAC duty at up to 768kHz/32-bit and DSD512, with a separate USB-C 3.0 port for data and charging.
Battery, charging and tuning
The 6500mAh battery supports 30W charge-pump fast charging and the QC3.0, QC4.0, PD2.0, PD3.0 and PPS protocols, with a full charge taking around 2.5 hours on PD3.0 PPS. FiiO rates playback at 9.5 hours from the 3.5mm output and 8.5 hours from the balanced output. A 31-band lossless parametric EQ with AUTO EQ allows precise tuning from the touchscreen, and a three-level second harmonic adjustment lets you add a touch of warmth. The CNC-machined chassis uses a faceted, gemstone-inspired design, and a retro UI with Pod Mode and Cassette Mode pairs with FiiO's RETRO BOX speaker (sold separately). A screen protector is pre-applied and a protective case and USB cable are included.
