FiiO M33 R2R

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

XMOS XU316 chip | 10-band PEQ, supports AUTO EQ

Fully differential 24Bit R2R resistor arrays | Multi-stage audio circuit with TI op-amps

1100mW+1100mW powerful output

M27-derived proprietary DAPS Digital Audio Purification System

5.5-inch 1080p HD display | 15.5 hours of long battery life

*Pictures are for reference only. The actual product may vary.

Selling points

Fully differential 24Bit R2R

resistor arrays

Multi-stage audio

circuit with TI op-amps

Qualcomm Snapdragon 680 Android13, 8GB+128GB large storage and RAM

XMOS XU316 chip

Synchronizes audio

and video.

Provides consistent audio-visual experiences.

Combines the rich, analog-like warmth unique to R2R with the qualities of a well-balanced, high-end audio source.

1100mW+1100mW balanced output power Easily drive your headphones.

Generous storage and memory combination compared to other devices in its class.

M27-derived proprietary DAPS Digital Audio Purification System

A significant leap in digital audio processing efficiency and quality.

10-band PEQ,

supports AUTO EQ

Next-gen minimalist design with clean lines

Headphone curve automatic matching.

A comfortable, lightweight, yet stunning device with 18:9 aspect ratio and weighing only 258g.

Ultra-long battery life

fast charging

1.5h to fully charge

13.5h of balanced playback

15.5h of single-ended playback

5.5-inch large HD display

Compatible with the RETRO BOX cassette-style Bluetooth speaker

Brand new cassette tape,

spectrum, and VU meter

themes make every song

more immersive and engaging.

Supports LDAC Bluetooth, features 5W*2 full-range output.

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

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.

Fully differential 24Bit R2R resistor arrays DAC

Four channels, a total of 192 precision thin-film

resistors with 0.1% accuracy and low temperature drift.

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.

Thickness

Weight

Width

Dual-beveled edging

AG matte glass back panel

18:9 Golden ratio

Minimalist design

Ergonomic comfort

Silky smooth feel

Perfect grip

Clean and premium

Flagship-grade proprietary DAPS (Digital Audio Purification System)

High-Capacity FPGA + Dual Custom Femtosecond Crystal Oscillators

 The M33 R2R is equipped with the same ultra-high precision, ultra-low jitter unified clock source found in the flagship M27, providing a massive leap in digital audio processing efficiency and fidelity compared to the M23.

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.

Carefully engineered audio circuit

Powered by TI

The pre-amp stage utilizes TI fully differential op-amps for I/V conversion and signal conditioning, delivering a natural and expansive soundstage. The output stage features quad INA1620 amp chips in a parallel configuration. Thanks to these chips, the result is output power up to 1100mW+1100mW to effortlessly drive any headphone. Finally, the precision electronic volume control ensures that you experience explosive dynamics without losing a hint of detail.

High-End audiophile components

4× Ti Burr-Brown INA1620

2x TI Burr-Brown OPA1637 fully differential audio op-amps

Minimizes crosstalk, ensuring no inter-channel interference even during overdrive or clipping conditions.

Explosive dynamics and masterful control over every note.

NJW1195A precision volume controller

8x Rubycon film capacitors

Provides high precision and ultra-low noise for accurate volume adjustment.

Achieves natural, transparent mids and smooth, fatigue-free treble.

65A High-Current MOSFETs for efficient power routing with minimal loss

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.

Massive capacitors for energy storage

15W Power management system with ample power headroom

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.

Battery capacity

Low-temperature fast charging

Fully charged

Single-ended playback

Balanced playback

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

Dual Type-C ports, Double the versatility

PSuper High Gain Mode

Equipped with four gain levels: Low, Medium, High, and Super High Gain Mode. Connect a fast charger to either Type-C port to activate Over-Ear Headphone mode, unlocking even more gain and output power. With an output of up to 1100mW+1100mW per channel, it easily drives demanding, high-impedance over-ear headphones.

Patented desktop mode

32Ω，Balanced， Super High Gain Mode

32Ω，Single-ended，

Bypasses the battery during use to handle high-power output without drain. This reduces charge/discharge cycles to significantly extend battery lifespan.

Patent number: ZL202321946664.8

double relay lossless transmission

Total Versatility, Wide Compatibility

Analog Outputs

3.5mm+4.4mm headphone outputs

Supports single-ended and balanced headphones.

3.5mm+4.4mm line outputs

With dedicated line-amp circuitry, connect to external speakers and amps to truly experience the magic of R2R sound.

Digital outputs

SPDIF output

Features a low-jitter coaxial signal processing circuit that rivals dedicated digital transports, with coaxial output jitter as low as 71.5ps. Pair with high-end external DACs for truly remarkable performance.

USB Audio output

Connect to external DACs or pair with the DK1PRO to instantly transform the device into a high-performance streaming transport.

Two-way high-res Bluetooth

Bluetooth transmission supports:

SBC/aptX/aptX HD/LHDC/LDAC

Bluetooth reception supports:

SBC/LDAC

Compatible with RETRO BOX

Bring your own soundtrack wherever

It is the perfect match for the RETRO BOX cassette-style Bluetooth speaker, opening up another way to enjoy music. The versatile UI of the RETRO BOX allows it to serve as both a decorative desktop centerpiece and your portable soundtrack source.

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

Total versatility, Wide compatibility

Customizable multi-function buttons

Leather protective case included

Five operating modes

One-click access to functions that you frequently use.

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

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

Packing List

①  --------------------------------------------------------M33 R2R*1

②  --------------Leather case (pre-installed onto device) *1

③  ------------------------------------------------USB data cable*1

④  ---------------------------------------------Quick start guide*1

⑤  --------------------------------------------------Warranty card*1

⑥  ------------------------------------------------GPL V2 manual*1

⑦  ----------Screen protector (pre-applied onto device) *1

Basic Parameters

Basic Specifications

Decoding Specifications

Local playback: 384kHz/32bit; DSD256 (Native) USB DAC: 768kHz/32bit; DSD512 (Native) USB Audio: 768kHz/32bit; DSD512 (supports DoP/D2P/Native) Coaxial output: 384kHz/24bit; DSD128 (DOP/D2P)

Hardware Specifications

Audio Parameters

Main processor: Qualcomm Snapdragon 680 DAC: FIIO proprietary R2R DAC USB: XMOS XU316 Display: 5.5-inch (1080*2160) fully laminated screen Battery capacity: 4400mAh

Frequency response: 20Hz~40kHz: attenuation＜3dB SNR: ≥117dB (A-weighted) Noise floor: ＜5.5μV (A-weighted) THD+N: PCM: 0.0183%; DSD: 0.0033% Crosstalk: ≥74dB (1kHz@32Ω)

Bluetooth Specifications

Bluetooth reception: 5.0, SBC/LDAC Bluetooth transmission: 5.0, SBC/aptX/aptX HD/LDAC/LHDC

Headphone output

Balanced output power 1: L+R≥1100mW+1100mW (32Ω, THD+N＜1%, 6Vrms, Super High Gain Mode) Balanced output power 2: L+R≥900mW+900mW (32Ω, THD+N＜1%, 5.4Vrms, High Gain) Balanced output power 3: L+R≥240mW+240mW (300Ω, THD+N＜1%, 8.5Vrms, Super High Gain Mode) Balanced output power 4: L+R≥165mW+165mW (300Ω, THD+N＜1%, 7Vrms, High Gain) Single-ended output power 1: L+R≥470mW+470mW (32Ω, THD+N＜1%, 3.9Vrms, Super High Gain Mode) Single-ended output power 2: L+R≥300mW+300mW (32Ω, THD+N＜1%, 3.1Vrms, High Gain)