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FIIO M33 R2R
Hi-Res DAP with 24-bit R2R DAC: natural timbre and “organic” sound.
Android 13 + Snapdragon 680: smooth streaming
Outputs 3.5 mm + 4.4 mm balanced (up to 1100 mW @32Ω)
WiFi + Bluetooth LDAC/LHDC + USB DAC (up to 768 kHz/32 bit, DSD512)
Up to 15.5 hours of battery life + PD fast charging
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FiiO M33 R2R: Music the way it’s meant to be heard
Rediscover your library with the FiiO M33 R2R, a portable Hi-Res DAP built for audiophiles who want natural timbre, serious amplifier power, and full connectivity in a truly versatile format. Its proprietary R2R DAC and fully differential architecture are designed to make every track sound more fluid, full-bodied and lifelike—whether you’re playing local files or streaming.
True R2R sound: more natural, more immersive
The M33 R2R features FiiO’s proprietary 24-bit R2R DAC in a fully differential configuration, engineered to deliver a more organic character than conventional DACs:
deeper, more stable soundstage
better micro-detail without harshness
wide dynamics with an “analogue-like” texture
The goal is clear: reproduce music naturally while preserving the original character of the recording.
Android 13 + Snapdragon 680: real streaming smoothness
With a Qualcomm Snapdragon 680 and 8 GB of RAM, the M33 R2R runs Android 13 effortlessly—perfect for streaming apps, large libraries and fast navigation. The fully laminated 5.5" Full HD display (1080 × 2160) enhances the experience with album art, playlists and lyrics.
Serious USB DAC with dedicated XMOS XU316
For use as a USB DAC (PC/Mac), it includes a dedicated XMOS XU316 for low latency and high stability, supporting:
up to 768 kHz / 32-bit.
native DSD512.
Ideal if you want the M33 R2R as the heart of a desktop setup without giving up the R2R signature.
Flagship-grade digital: FPGA + dual femtosecond clocks
It features a DAPS digital purification system with a high-capacity FPGA and dual femtosecond crystal oscillators, designed to reduce jitter and improve timing accuracy. The result: a cleaner, better-focused sound with a quieter background.
Real power for any headphone
The M33 R2R isn’t just refined—it’s powerful. Its output stage uses 4 × TI Burr-Brown INA1620 op-amps in parallel plus a precision volume system, driving everything from sensitive IEMs to demanding headphones.
4.4 mm balanced: up to 1100 mW + 1100 mW @ 32 Ω.
3.5 mm single-ended: up to 470 mW + 470 mW @ 32 Ω.
“Super High Gain” mode for extra voltage and control.
Audiophile components + multi-stage power design
Independent power sections for digital/analogue, and within the analogue stage, separate rails for the R2R matrix / preamp / amplification. Add partitioned shielding to minimise interference and crosstalk: a blacker background, better separation and greater cleanliness.
AUTO EQ + 10-band PEQ: your sound, without the hassle
Includes AUTO EQ for quick headphone matching and a 10-band parametric EQ for manual fine tuning. It also offers Natural / Warm sound profiles to shift character with a tap.
Full connectivity: mobile and full HiFi system
Wi-Fi 2.4/5 GHz with DLNA / AirPlay + Wi-Fi music transfer
Bluetooth transmit: SBC / aptX / aptX HD / LDAC / LHDC + receive: SBC / LDAC
Coaxial S/PDIF out: up to 384 kHz / 24-bit; DSD128 DoP/D2P
USB Audio / bidirectional USB DAC
3.5 mm + 4.4 mm headphone and line outputs, with dedicated line circuits
Real battery life + fast charging
4400 mAh battery with PD2.0/PD3.0 PPS fast charge (up to 30 W):
full charge in ~1.5 h
up to 15.5 h (3.5 mm)
up to 13.5 h (4.4 mm balanced)
Technical specifications
Model: M33 R2R
Platform: Qualcomm Snapdragon 680
RAM: 8 GB
Internal storage: 128 GB (112 GB usable)
microSD: up to 2 TB
Display: 5.5" Full HD (1080 × 2160), fully laminated
Modes: Android / Pure Music / AirPlay / USB DAC / Bluetooth Receiver
Volume control: physical buttons
Gain: Over-ear / High / Medium / Low
Sound profiles: Natural / Warm
EQ: 10-band PEQ + AUTO EQ
MQA: compatible global decoding
ALL TO DSD: Yes
Updates: local / microSD / OTA
Audio & resolutions
DAC: FiiO proprietary R2R (24-bit, differential)
USB DAC (XMOS XU316): up to 768 kHz / 32-bit; native DSD512
Local DAC: up to 384 kHz / 32-bit; native DSD256
USB Audio: 768 kHz / 32-bit; DSD512 (DoP/D2P/native)
Coax out: up to 384 kHz / 24-bit; DSD128 (DoP/D2P)
Connectivity
Wi-Fi: 2.4/5 GHz, DLNA/AirPlay
Bluetooth transmit: SBC / aptX / aptX HD / LDAC / LHDC
Bluetooth receive: SBC / LDAC
Remote control: via Wi-Fi
Power (High gain / Over-ear)
3.5 mm (SE)
≥470 mW + 470 mW @ 32 Ω
THD+N: PCM 0.0183% / DSD 0.0033%
SNR ≥117 dB | DR ≥114 dB
Noise <5.5 μV | Output impedance <0.8 Ω
Vp-p >12 Vp-p
4.4 mm (BAL)
≥1100 mW + 1100 mW @ 32 Ω
THD+N: PCM 0.0171% / DSD 0.0033%
SNR ≥116 dB | DR ≥115 dB
Separation ≥104 dB | Vp-p >24 Vp-p
4.4 mm line out (BAL)
Line level: 4 Vrms (1 kHz @10 kΩ)
SNR ≥118 dB | Separation ≥105 dB
Noise <4.9 μV
Battery, charging, size
Fast charging: PD2.0 / PD3.0 PPS
Charging time: ~1.5 h
Battery life: 15.5 h (3.5 mm) / 13.5 h (4.4 mm)
Dimensions: 138.2 × 71.5 × 17 mm
Weight: 258 g
Finishes: Retro Gold / Dark Blue / Black
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