M25 R2R

A Desktop Player in the Palm of Your Hand | Two Distinct Sound Signatures
Drawing on two decades of audio engineering experience, the FiiO M25 combines a compact, palm-sized design with a high-performance audio architecture. Its dual sound signatures offer two distinct listening experiences: the modern presentation of AKM DAC technology and the classic warmth of R2R conversion. Designed to bring desktop-inspired performance to a compact player, the M25 offers versatility without compromising on sound quality.

Powerful Performance | QCS6490 with Snapdragon 778G-Class Architecture
An eight-core processor with a high-performance A78 core running at up to 2.7GHz provides responsive performance for demanding tasks. Combined with generous memory and storage, the M25 handles multiple background applications, large music libraries and streaming playback smoothly and reliably.

FiiO-Developed 24+5-Bit Segmented R2R PRO Resistor Array
The segmented R2R PRO architecture uses 31 thermometer-coded resistors to decode the upper five bits, helping address error accumulation associated with conventional R2R designs and reduce distortion. This approach retains the characteristic warmth of R2R conversion while aiming to deliver greater detail, resolution, dynamic expression and a more expansive soundstage.

Full Desktop-Class Audio Architecture
Engineered to desktop-class standards, the M25 features a fully differential audio architecture with four independent signal paths extending from decoding and volume control to the headphone amplifier output. This design combines the natural, warm character of R2R conversion with powerful, authoritative headphone-driving performance.

AKM Flagship DAC Configuration | AK419EQ and Dual AK4499EX
The M25 uses an AK419EQ and two AK4499EX DACs, with one AK4499EX dedicated to each channel. This configuration helps reduce common-mode interference while improving channel separation and dynamic performance. Fully separated digital and analogue circuitry works alongside AKM's DWA Routing Technology to provide a cleaner background and support detailed, accurate reproduction. Combined with a carefully selected op-amp stage, the result balances warmth with refinement and clarity.

Multi-Stage Power Purification | Zoned Multi-Rail Power Supply
Multi-stage power purification and independently managed power-supply zones help suppress electrical noise and reduce interference between internal modules. This approach supports a cleaner sonic background while providing stable power to the audio circuitry.

Sixth-Generation FiiO Digital Audio Purification System (DAPS)
FiiO's latest-generation DAPS combines a high-capacity FPGA, also used in the M27, with custom high-performance dual femtosecond crystal oscillators. This system is designed to support highly precise digital signal processing and low-jitter transmission, helping maintain a clean, stable audio signal.

31-Band Lossless PEQ and Auto EQ | Personalised Sound Tuning

31-Band High-Precision Lossless PEQ: Fine-tune the sound, compensate for headphone frequency-response characteristics and customise the listening experience.

Auto EQ and Preset Sound Profiles: Explore alternative sound profiles with a single tap, without requiring previous equalisation experience.

Online Community EQ Sharing: Share and download EQ curves to discover profiles created by audio enthusiasts around the world.

6,500mAh Battery | Fast Charging and Enhanced Thermal Safety
The M25 features a 6,500mAh battery designed to support extended listening sessions. Its 30W charge-pump fast-charging system is compatible with QC3.0, QC4.0, PD3.0 and PPS charging protocols, helping recharge the player efficiently.

Dual Power Supply | Versatile Listening Modes

Patented Desktop Mode: Isolates the battery from high-power operation to reduce unnecessary charge and discharge cycles, helping preserve battery longevity.

Super High Gain Mode: Connecting a fast charger to either USB-C port enables Super High Gain Mode, delivering up to 1,700mW + 1,700mW of output power to drive a wide range of headphones.

Clean Drive: Carefully tuned power delivery, hardware gain and low-temperature-drift thin-film resistors and capacitors help minimise output noise.

Comfortable in Hand, Powerful at Heart
A 5.5-inch high-resolution display provides a spacious viewing area with clear, well-organised interface elements. Carefully considered proportions combine the benefits of a larger screen with a compact design that remains comfortable to hold and operate in one hand.

Futuristic Diamond-Cut Design | Sculpted by Light and Shadow
Inspired by the precision of gemstone cutting, the M25 features multidirectional facets that create a distinctive, architectural appearance. CNC-machined surfaces catch and reflect light from different angles, revealing depth and texture while maintaining a refined, understated finish.