FiiO M33 R2R High-Resolution Digital Audio Player
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FiiO M33 R2R High-Resolution Digital Audio Player
Overview
The FiiO M33 R2R is a portable Android digital audio player built around FiiO's own fully differential 24-bit R2R resistor-ladder DAC, with a Qualcomm Snapdragon 680, a 5.5-inch 1080 x 2160 screen and up to 1100mW per channel balanced. It's for listeners who want the natural, full-bodied sound R2R conversion is known for in a player they can carry, with streaming, Wi-Fi and enough power for full-size headphones.
The four-channel R2R DAC uses 192 precision thin-film resistors with 0.1% accuracy and low temperature drift, followed by a multi-stage circuit with TI op-amps and separate power supplies for the digital and analog stages. You can pick a Natural sound profile (NOS) or a Warmer sound. With a fast charger connected, the top gain mode switches to a high-voltage rail for 1100mW per channel into 32 ohms from the 4.4mm output and 470mW from the 3.5mm output; on battery, high gain gives up to 900mW balanced. FiiO's patented desktop mode bypasses the battery when running from external power.
It runs Android 13 with 8GB of RAM, 128GB of storage (about 112GB usable) and a microSD slot up to 2TB, with 2.4GHz/5GHz Wi-Fi, AirPlay and DLNA, plus Pure Music, USB DAC and Bluetooth receiver modes. Local playback reaches 384kHz/32-bit and native DSD256, USB DAC mode 768kHz/32-bit and DSD512, and MQA is decoded. A 10-band PEQ supports AUTO EQ, the 3.5mm jack doubles as a coaxial output, and Bluetooth 5.0 transmits LDAC and LHDC and receives LDAC. The 4400mAh battery runs up to 15.5 hours single-ended or 13.5 hours balanced, charging in about 1.5 hours.
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The full 1100mW balanced output needs a fast charger connected, which switches the M33 R2R onto its high-voltage rail; on battery you still get up to 900mW balanced on high gain, plenty for most headphones. At a desk, use desktop mode with power on the POWER IN port so the battery is bypassed. Try the Natural (NOS) and Warmer sound profiles on music you know well, since each presents the R2R DAC a little differently.
More Info
Why the FiiO M33 R2R Stands Out
FiiO 24-Bit R2R DAC
192 precision resistors, fully differential.
Up to 1100mW Balanced
High-voltage rail with a fast charger.
Two Sound Profiles
Natural (NOS) or Warmer.
Patented Desktop Mode
Bypasses the battery on external power.
Android 13 Streaming
Wi-Fi, AirPlay and DLNA.
15.5-Hour Battery
4400mAh with PD fast charging.
Buyer's Guide
Who It's For
- The R2R Listener: Wants resistor-ladder sound on the go.
- The Streaming Listener: Wants Android apps on a dedicated player.
- The Full-Size Headphone Owner: Needs up to 1100mW balanced.
How It Compares
Compared with the FiiO M21, the M33 R2R replaces four CS43198 chips with FiiO's R2R resistor-ladder DAC and adds Natural and Warmer sound profiles, a larger 5.5-inch screen, 8GB of RAM, 128GB of storage and a bigger battery, and raises balanced output from 950mW to 1100mW.
FiiO M33 R2R High-Resolution Digital Audio Player Specifications
| General Information | |
|---|---|
| Model | FiiO M33 R2R |
| Brand | FiiO |
| Product Type | Portable Android digital audio player |
| Colours Available | Retro Gold, Dark Blue, Black |
| System | |
| SoC | Qualcomm Snapdragon 680 |
| OS | Android 13 |
| RAM / Storage | 8GB / 128GB (about 112GB usable) |
| Expansion | microSD, up to 2TB |
| Display | 5.5-inch, 1080 x 2160 |
| Modes | Android, Pure Music, AirPlay, USB DAC, Bluetooth receiver |
| Audio | |
| DAC | FiiO fully differential 24-bit R2R (192 resistors, 0.1%) |
| USB Receiver | XMOS XU316 |
| Sound Profiles | Natural (NOS), Warmer |
| Local Playback | Up to 384kHz/32-bit, DSD256 (native) |
| USB DAC | Up to 768kHz/32-bit, DSD512 (native) |
| MQA | Global decoding |
| PEQ | 10-band, AUTO EQ |
| Gain | Over-ear headphone mode (fast charger), high, medium, low |
| Recommended Impedance | 8 to 350Ω |
| 3.5mm Output (Natural Sound) | |
| Over-Ear Mode | 470mW+470mW @ 32Ω; 540mW+540mW @ 16Ω; 60mW+60mW @ 300Ω |
| High Gain | 300mW+300mW @ 32Ω |
| SNR | ≥117dB (A-weighted) |
| THD+N | PCM 0.0183%; DSD 0.0033% |
| Output Impedance | <0.8Ω |
| 4.4mm Balanced Output (Natural Sound) | |
| Over-Ear Mode | 1100mW+1100mW @ 32Ω; 540mW+540mW @ 16Ω; 240mW+240mW @ 300Ω |
| High Gain | 900mW+900mW @ 32Ω; 165mW+165mW @ 300Ω |
| SNR | ≥116dB (A-weighted) |
| THD+N | PCM 0.0171%; DSD 0.0033% |
| Output Impedance | <1.5Ω |
| Connectivity | |
| Wi-Fi | 2.4GHz/5GHz; AirPlay, DLNA |
| Bluetooth | 5.0; transmit SBC, aptX, aptX HD, LDAC, LHDC; receive SBC, LDAC |
| Outputs | 3.5mm (headphone/line/coaxial), 4.4mm (headphone/line) |
| Coaxial Out | Up to 384kHz/24-bit, DSD128 |
| USB | USB-C 3.0 + USB-C POWER IN |
| Switch | D.MODE |
| Battery and Physical | |
| Battery | 4400mAh; 15.5h single-ended, 13.5h balanced |
| Charging | PD2.0/PD3.0 PPS; about 1.5h |
| Dimensions | About 138.2 x 71.5 x 17mm |
| Weight | About 258g |
| In the Box | Leather case, USB cable, screen protector (pre-applied) |
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