FiiO M33 R2R

Portable smart high-resolution audio player

• Qualcomm Snapdragon 680
• Android 13, 8 GB + 128 GB large memory and RAM
• XMOS XU316 chip
• 10-band PEQ, supports AUTO EQ
• Fully differential 24-bit R2R resistor arrays
• Multi-stage audio circuit with TI operational amplifiers
• 1100 mW + 1100 mW powerful output power
• 5.5-inch 1080p HD display
• 15.5 hours of battery life
• Two sound profiles: “Flat” and “Warm”

Qualcomm Snapdragon 680 + Android 13, 8 GB + 128 GB large memory and RAM

More generous memory and RAM combination compared to other devices in its class, enabling smooth media streaming and effortless multitasking.

XMOS XU316 chip

Helps synchronize audio and video when used as a USB DAC, ensuring a consistent audiovisual experience in any situation.

From desktop to portable device – the evolution of R2R

FiiOs has integrated the proprietary R2R resistor array, originally developed for desktop devices, into a portable player for the first time. Designed by experienced acoustic engineers and perfected through feedback from the global audiophile community, it offers the ultimate listening experience.

The distinctive, rich analog warmth traditionally associated with R2R, combined with balanced high-fidelity performance

Fully differential 24-bit R2R resistor array DAC.

Four channels, a total of 192 precision thin-film resistors with 0.1% accuracy and low temperature drift.

Extensive memory, consistently smooth performance

The Qualcomm Snapdragon 680 and the M33 R2R's extensive 8 GB RAM + 128 GB ROM memory are unmatched in its class. Experience effortless streaming and seamless multitasking. It offers extra power and storage to handle future updates with ease and ensure a stable and long-lasting experience for years to come.

Perfect audiovisual synchronization with USB DAC, supported by a dedicated “core”

Are you 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 flawless audio synchronization that remains consistent across all your devices.

Large 5.5-inch HD display, more than just size

Experience total immersion with a high-resolution display designed for high-fidelity entertainment. New cassette, spectrum, and VU meter visualizations let you dive deeper into the music and give each track a classic retro flair.

1080*2160 resolution, third-generation Corning Gorilla Glass, oleophobic coating, pre-installed tempered glass screen protector.

Ultra-slim comfort, impressive at first touch

Like the minimalist design of the FIIO M21, the sleek, refined lines of the M33 R2R create an elegant aesthetic. Thanks to clever engineering, FiiO has found the perfect balance between size and ergonomics. It's not just about the impressive numbers on the M33 R2R's spec sheet, but also the seamless, natural feel in your hand.

18:9 golden ratio

Minimalist design

Clear and high-quality double-beveled edges

Ergonomic comfort - matte AG glass back Silky smooth feel Compared to the M23 aluminum alloy edition

Flagship-worthy proprietary DAPS (Digital Audio Purification System)

High-performance FPGA + two custom-made femtosecond quartz oscillators

Equipped with the same ultra-precise, extremely low-jitter unified clock source as the flagship M27, the M33 R2R offers a huge leap in efficiency and fidelity in digital audio processing compared to the M23.

With FiiO's proprietary DAPS (Digital Audio Purification System), this advanced architecture creates a unified clock source with extremely low jitter while providing enhanced signal processing capabilities that ensure perfect audio reproduction throughout the entire signal chain.

Supports AUTO EQ Your ideal sound, just a tap away

Do you find the manual adjustment of the lossless 10-band PEQ too complex?

AUTO EQ automatically adjusts to the frequency curve of your headphones and instantly delivers your ideal sound profile with lossless precision. In addition to sound presets such as pop, jazz, and classical, the app also supports detailed adjustment per band, allowing you to customize your sound.

Carefully designed audio circuitry, powered by TI

The preamplifier stage uses fully differential operational amplifiers from TI for I/V conversion and signal processing, delivering a natural and room-filling sound. The output stage features four INA1620 amplifier chips in parallel configuration. These chips provide up to 1100 mW + 1100 mW of output power to effortlessly drive any headphones. Finally, precise electronic volume control ensures that you experience explosive dynamics without losing a single detail.

High-end components for audiophiles 2x TI Burr-Brown OPA1637 fully differential audio operational amplifiers

Explosive dynamics and masterful control over every note.

4× Ti Burr-Brown INA1620

Minimizes crosstalk and ensures that there is no interference between channels, even when overdriven or clipped.

8x Rubycon film capacitors

Ensures natural, transparent mids and smooth, fatigue-free highs.

Precision volume control NJW1195A

Offers high precision and extremely low noise for accurate volume control.

Precise power supply system

There are independent power supplies for digital and analog stages. The analog stage uses three separate circuits for the R2R arrangement, the preamplifier stage, and the amplifier stage, ensuring a more refined and natural sound. The amplifier power supply supports two voltage levels. Activating “Over-Ear Headphone Mode” triggers the high-voltage rail, increasing the output power to 1100 mW + 1100 mW, allowing both sensitive IEMs and demanding over-ear headphones to be driven effortlessly.

65A high-current MOSFETs for efficient power distribution with minimal losses, massive capacitors for energy storage, and a 15W power management system with ample power reserves.

Multi-stage, compartmentalized shielding for pure sound

To ensure the cleanest possible sound, the digital audio processing, R2R array, amplifier, and power modules are housed in separate areas with independent shielding. This significantly reduces signal interference and crosstalk, resulting in a “blacker,” extremely quiet background with a clearer soundstage that brings out every musical detail.

15.5 hours of extremely long battery life, no more worrying about running out of power

With a high-quality, high-capacity 4400 mAh battery, both single-ended and balanced playback times have been significantly improved over the M23. Thanks to fast charging at low temperatures, the M33 R2R can be charged quickly without overheating. Thanks to the long-lasting battery and fast charging function, your music never has to be interrupted. 30W fast charging at low temperatures Fully charged in 1.5 hours 15.5 hours of single-ended playback time 13.5 hours of balanced playback time.

*Data from FIIO Labs. Actual performance may vary depending on usage and environmental factors.

Two Type-C ports, double the versatility Patented desktop mode

Bypasses the battery during use to enable high power output without discharge. This reduces charging/discharging cycles, significantly extending battery life. Patent number: ZL202321946664.8

Over-ear headphone mode

Equipped with four gain levels: low, medium, high, and over-ear headphones.

Connect a fast charger to either of the two Type-C ports to activate over-ear headphone mode and get even more amplification and output power. With up to 1100 mW + 1100 mW per channel, it easily drives demanding, high-impedance over-ear headphones.

Versatility and broad compatibility

Analog outputs

3.5 mm and 4.4 mm headphone outputs:

Supports single-ended and balanced headphones.

3.5 mm and 4.4 mm line outputs: With dedicated line amplifier circuitry, you can connect external speakers and amplifiers to truly experience the magic of R2R sound.

Digital outputs

SPDIF output: Features low-jitter coaxial signal processing circuitry that rivals dedicated digital transport systems, with a coaxial output jitter of only 71.5 ps. Combined with high-quality external DACs, you'll achieve truly remarkable performance.

USB audio output: Connect external DACs or combine the device with the DK1PRO to instantly transform it into a powerful streaming transport.

High-resolution two-way Bluetooth: Bluetooth transmission supports SBC/aptX/aptX HD/LHDC/LDAC; Bluetooth reception supports SBC/LDAC.

Compatible with RETRO BOX, take your own music with you wherever you go

It's the perfect complement to the cassette-style RETRO BOX Bluetooth speaker, opening up another way to enjoy music. Thanks to the RETRO BOX's versatile user interface, it can serve as both a decorative tabletop device and a portable music source.

*RETRO BOX is not included and must be purchased separately.

Absolute versatility, broad compatibility

Five operating modes

Choose between Android, Pure Music, AirPlay, USB DAC, and Bluetooth reception modes.

Customizable multifunction buttons

Access frequently used functions with a single click.

Leather protective case included

The retro gold version comes with a khaki-colored leather case, while the dark blue and black versions come with a color-coordinated leather case.