FiiO M33 R2R Hi-Res Portable Digital Audio Player

From desktop to portable
The evolution of R2R
We’ve taken our proprietary R2R resistor array originally designed for desktop equipment, and brought it over to a portable player for the first time.
Shaped by the ears of expert acoustic engineers and perfected through feedback from the global audiophile community, it delivers the ultimate listening experience:
The unmistakable, lush analog warmth traditionally associated with R2R combined with balanced, high-fidelity performance.

Extensive storage
Enduringly smooth performance
The Qualcomm Snapdragon 680 and an expansive 8GB RAM + 128GB ROM storage featured in the M33 R2R is unmatched in its class. Experience effortless streaming and seamless multitasking. It offers extra performance and storage to easily handle any future updates as well as to ensure a stable and durable experience for years to come.

Perfect USB DAC audio-visual sync
Powered by a dedicated "core"
Frustrated by high latency when using a USB DAC for songs or videos?
A dedicated XMOS XU316 chip provides ultra-low latency and robust performance, ensuring flawlessly synchronized audio that stays consistent across all your devices.

Large 5.5-inch HD Display
Beyond just size
Experience total immersion with a high-definition display designed for high-fidelity entertainment. New cassette tape, spectrum, and VU meter visuals pull you deeper into the music and give every track a classic retro flair.

Ultra-slim comfort, Stunning at first touch
Like with the minimalist design featured on the FIIO M21, the sleek, refined lines of the M33 R2R create a sophisticated aesthetic. Clever engineering allows us to strike the perfect balance between size and ergonomics. It's not just about the impressive numbers on the M33 R2R’s spec sheet, it’s about that seamless, natural feel in your hand.

Supports AUTO EQ
Your ideal sound, just a tap away
Find manually adjusting the 10-band lossless PEQ too complex?
AUTO EQ automatically matches your headphone’s frequency curve, delivering your ideal sound profile instantly with lossless precision. In addition to sound presets such as pop, jazz and classical, the app also supports granular, per-band customization – allowing you to personally tune your own sound.

Precision power supply system
There are independent power supplies for digital and analog stages. The analog stage utilizes three separate power circuits for the R2R array, pre-amp, and amp stages, ensuring a more refined and natural sound signature.
The amp power supply supports two voltage tiers. Activating "Super High Gain Mode" triggers the high-voltage rail, boosting output power to 1100mW+1100mW that allows it to effortlessly drive everything from sensitive IEMs to demanding over-ear headphones.

Multi-Stage Partitioned Shielding
Restoring pure sound
To ensure the cleanest audio possible, the digital audio processing, R2R array, amp, and power modules are housed in separate zones with independent shielding. This significantly reduces signal interference and crosstalk, resulting in a "blacker", ultra-silent background with a clearer soundstage where every musical detail shines through.

15.5 Hours of ultra-long battery life
Say goodbye to power anxiety
Featuring a premium 4400mAh high-capacity battery, both single-ended and balanced playback times are significantly improved over the M23. Low-temperature fast charging means the M33 R2R powers up quickly without overheating. Between the long-lasting battery and rapid charging, your music never has to stop.