The M33 is FiiO’s first R2R digital audio player, delivering an analog-like sound and substantial power, suitable for both portable and desktop listening.
Uncompromising Sound Quality
FiiO’s first R2R-based portable player combines a ladder DAC architecture with a compact, Android-powered device designed for everyday use—whether on the go or at your desk. The Snapdragon 680 platform ensures a fantastic user experience, the 5.5-inch 1080p display is a pleasure to view, and a multi-stage, TI-based amplifier provides clean power through both balanced and single-ended outputs.
R2R Decoding
This player utilizes a true R2R DAC architecture, rather than a traditional delta-sigma design. The resistor-ladder conversion ensures precise voltage scaling and natural timing—qualities that many listeners associate with a grounded, analog-like presentation. FiiO complements this with selectable OS (oversampling) and NOS (non-oversampling) modes, allowing you to choose between oversampling for enhanced precision or a non-oversampling approach for a more direct signal path.
Flagship-grade amplification
The internal amplification circuitry is derived from higher-end FiiO models, utilizing a multi-stage architecture inspired by the brand’s flagship series. This design ensures consistent gain levels and reduced noise under load. It delivers stable performance for everything from sensitive in-ear monitors to demanding full-sized headphones, whether you are listening on the go or at your desk. A power output of 1100 mW is achieved via the 4.4mm balanced output in "Ultra High" gain mode (into a 32-ohm load). Using the 3.5mm output in the same gain mode provides up to 470 mW of power (into 32 ohms). This high-output mode is available only when using a charger that supports the PD 3.0 fast-charging standard.
Android platform
Powered by a Snapdragon 680 processor, the Android 13 operating system offers ample headroom for modern streaming apps and local file playback. The M33 R2R is the first FiiO digital audio player to feature 8 GB of RAM and 128 GB of internal storage.
Support for a large amount of internal storage means fewer compromises when working with high-resolution libraries, while system responsiveness remains predictable during daily use. This configuration ensures smooth navigation within the Android 13 operating system and efficient multitasking across multiple applications.
Desktop Mode
When needed, charging via the dual USB ports can be handled separately from playback, which reduces electrical interference during extended listening sessions. Desktop Mode is designed for stationary use, allowing the player to function as a compact DAC and preamplifier without charging the battery.
Battery Life
The 4400 mAh battery provides up to 15.5 hours of playback. When it’s time to recharge, 30W low-temperature charging technology ensures high-speed power delivery while managing heat, helping to preserve the battery's health over the long term.
Parametric Equalizer (PEQ) and Auto EQ
Like the JM21 and M21 models, the M33 features a global parametric equalizer (PEQ), which allows for system-wide equalization across any installed application. The device also supports Auto EQ—a tool that automatically generates equalization profiles designed to achieve a more “neutral,” “balanced,” and “natural” sound. Auto EQ utilizes frequency response measurements from sources such as Oratory1990, Crinacle, and RTINGS to calculate equalization parameters and adjust the sound characteristics of your headphones according to your personal preferences.
Sound Profile Selection
The M33 allows users to choose between two sound profiles: FLAT (natural sound) and WARM (a warm sound signature).
No Audio-Video Playback Latency
When using the M33 as a USB DAC connected to a PC, there is no audio playback latency. This is made possible by the dedicated XMOS XU316 USB processor, which ensures proper synchronization between audio and video when viewing content, such as music videos on YouTube.
Larger Full HD Display
The M33 features a 5.5-inch display, an upgrade from the 4.7-inch screens found in the M21 and JM21 models. The display has a resolution of 2160×1080 pixels, which is slightly higher than standard Full HD (1920×1080). A protective glass layer and a screen protector are pre-applied to safeguard the display.
Output Power
- Balanced output power 1: 1100 mW + 1100 mW (32 Ω, THD+N < 1%, 6 V, Ultra-High Gain mode);
- Balanced output power 2: 900 mW + 900 mW (32 Ω, THD+N < 1%, 5.4 Vrms, High Gain mode);
- Balanced output power 3: 240 mW + 240 mW (300 Ω, THD+N < 1%, 8.5 Vrms, Ultra-High Gain mode);
- Balanced output power 4: 165 mW + 165 mW (300 Ω, THD+N < 1%, 7 Vrms, High Gain mode);
- Single-ended output power 1: 470 mW + 470 mW (32 Ω, THD+N < 1%, 3.9 Vrms, Ultra-High Gain mode);
- Single-ended output power 2: 300 mW + 300 mW (32 Ω, THD+N < 1%, 3.1 Vrms, High Gain mode).
Package includes:
- Player
- Leather case
- USB cable
- Manual.
