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

Selling points

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

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

XMOS XU316 chip

Helps to synchronize audio and

video when used as USB DAC,

providing a consistent audio-

visual experience under any scenario.

Fully differential 24Bit R2R

resistor arrays

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

Multi-stage audio

circuit with TI op-amps

A balanced output power of up to 1100mW+1100mW means it can easily drive a wide

M27-derived proprietary DAPS Digital Audio Purification System

A significant leap in digital audio

processing efficiency and quality.

10-band PEQ,

supports AUTO EQ

Automatically matches a

frequency response curve

to your headphone.

Ultra-long battery life

fast charging

1.5h to fully charge

15.5h of single-ended playback

13.5h of balanced playback

Next-gen minimalist design with clean lines

A comfortable, lightweight,

yet stunning device with 18:9 aspect

ratio and weighing only 258g.

Compatible with the RETRO BOX cassette-

style Bluetooth speaker

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

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

5.5-inch large HD display

Brand new cassette tape,

spectrum, and VU meter

themes make every song

more immersive and engaging.

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.

Extensive storage

Enduringly smooth performance

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.

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.

Large 5.5-Inch HD Display

Beyond just size

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.

18:9 Golden ratio

Perfect grip

Minimalist design

Clean and premium

Dual-beveled edging

Ergonomic comfort

AG matte glass back panel

Silky smooth feel

Weight

Thickness

Width

 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.

Flagship-grade proprietary DAPS (Digital Audio Purification System)

High-Capacity FPGA + Dual Custom Femtosecond Crystal Oscillators
 

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.
 

Supports AUTO EQ

Your ideal sound, just a tap away

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.

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

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.

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

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

double relay lossless transmission

Dual Type-C ports, Double the versatility

Patented desktop mode

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

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.

32Ω，Balanced，
Super High Gain Mode

32Ω，Single-ended，
Super High Gain Mode

Total Versatility, Wide Compatibility

Analog Outputs

3.5mm+4.4mm headphone outputs

Supports single-ended and balanced headphones.

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

3.5mm+4.4mm line outputs

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

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.

SPDIF output

USB Audio output

Digital outputs

Bluetooth transmission supports:

SBC/aptX/aptX HD/LHDC/LDAC

Two-way high-res Bluetooth

Bluetooth reception supports:

SBC/LDAC

Total versatility, Wide compatibility

Five operating modes

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

Customizable multi-function buttons

One-click access to functions that you frequently use.

Leather protective case included

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

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.

From desktop to portable

The evolution of R2R

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.

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

Packing List

Basic Specifications

Basic Parameters

Color: Retro gold/dark blue/black
Dimensions: about 138.2x71.5x17mm
Weight: about 258g
Memory (RAM): 8GB
Internal storage (ROM): 128GB (about 112GB usable)
Storage expansion: supports up to 2 TB micro-SD cards

Hardware Specifications

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

Bluetooth Specifications

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

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)

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)

Audio Parameters

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)

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

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

Explosive dynamics and masterful control over every note.

4× Ti Burr-Brown INA1620

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

8x Rubycon film capacitors

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

NJW1195A precision volume controller

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

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.