The FiiO M33 R2R is an audiophile Android digital audio player (DAP) with a fully differential 24-bit R2R DAC, 1100 mW of power and desktop mode.
The FiiO M33 R2R is an audiophile Android player (DAP) that brings, for the first time, to a portable device the R2R resistor-ladder converter FiiO designed for its desktop products. Its fully differential 24-bit R2R DAC lines up four channels totalling 192 thin-film resistors with 0.1 % precision, for the analogue warmth typical of R2R combined with a balanced, faithful reproduction.
The analogue stage delivers up to 1100 mW + 1100 mW into 32 ohms balanced in Super High Gain mode, across four gain levels. It relies on fully differential TI Burr-Brown OPA1637 operational amplifiers and four INA1620 in parallel, Rubycon capacitors and an NJW1195A volume control. The outputs include 3.5 mm and 4.4 mm headphone jacks, line outputs, coaxial SPDIF and USB Audio.
The M33 R2R is built on a Qualcomm Snapdragon 680 SoC running Android 13, with 8 GB of RAM and 128 GB of storage (about 112 GB usable) expandable by microSD up to 2 TB. An XMOS XU316 USB interface provides a low-latency USB DAC mode. The screen measures 5.5 inches at 1080x2160. The 10-band parametric equaliser with AUTO EQ and the DAPS system derived from the M27 refine the sound.
A 4400 mAh battery provides about 15.5 hours of listening, with low-temperature fast charging (about 1 h 30 for a full charge). The 18:9 chassis weighs 258 g and has a frosted AG glass back. Desktop mode bypasses the battery and two USB-C ports bring added versatility. A leather case is supplied. The M33 R2R comes in retro gold, dark blue and black.
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Specific References
The FiiO FH11 in black is a wired hybrid in-ear monitor (1 dynamic 10 mm driver and 1 balanced armature), Hi-Res Audio certified, with a detachable 0.78 mm 2-pin cable.
The FiiO FA19 is a wired in-ear headphone featuring 10 Knowles balanced armature drivers, a Monitor/HiFi switch, a 3D-printed shell, and a pure silver cable, and is Hi-Res Audio certified.
The FiiO FD15 is a wired in-ear monitor with a 13.8 mm dynamic driver with a magnalium diaphragm, a 316L steel shell and a detachable Furukawa MMCX cable.
The FiiO FD3 is a wired in-ear monitor with a 12 mm dynamic driver with a DLC diaphragm, an aluminium-magnesium body, interchangeable tubes and Hi-Res Audio certification.
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