FiiO M33 R2R DAP Portable Hi Resolution Digital Audio Music Player Black

The FiiO M33 is a portable hi-resolution digital audio player (DAP) built around FiiO's first proprietary R2R resistor ladder DAC, running Android on a Snapdragon 680 platform with a 5.5-inch 1080p touchscreen and balanced 4.4mm plus 3.5mm outputs. It is part of the FiiO M-series DAP range.

This listing is the black finish.

Key specifications

• DAC: FiiO proprietary fully differential 24-bit R2R, with OS and NOS modes
• Platform: Snapdragon 680, Android
• Display: 5.5-inch 1080p touchscreen
• Storage: 128GB internal, 8GB RAM, micro-SD up to 2TB
• Analogue outputs: 1 x 3.5mm, 1 x 4.4mm balanced
• Digital output: 3.5mm coaxial (384kHz/24-bit, DSD128)
• Battery: 4400mAh
• Signal-to-noise ratio: ≥117dB (A-weighted)
• Dimensions and weight: 138.2 x 71.5 x 17mm, 258g

Pure audio performance

The M33 introduces R2R resistor ladder DAC technology into a compact, Android-enabled portable player designed for daily listening and desktop use. A Snapdragon 680 chipset drives a responsive interface, the 5.5-inch 1080p screen is comfortable to navigate, and a titanium-based multi-stage amplifier supplies clean output through both balanced and single-ended connections.

Reference-grade amplification design

The amplifier design draws from FiiO's premium models, using a full-series titanium multi-stage configuration to maintain uniformity across gain levels and reduce noise under load. It handles sensitive in-ear monitors and power-hungry full-size headphones equally well, whether used portably or at a desk.

• True 24-bit fully differential R2R DAC with precision thin-film resistor arrays
• Titanium multi-stage amplifier with balanced and single-ended outputs
• Snapdragon 680 Android platform with smooth UI and streaming support
• Advanced shielding, thermal control and protection circuitry
• NJW1195A electronic volume system for low-noise, precise level adjustment

Precision electronic volume control: NJW1195A

The NJW1195A is a four-channel electronic attenuator using a resistor ladder potentiometer for accurate, low-distortion volume adjustment. Volume transitions are smooth and precisely graduated without sacrificing transparency.

Authentic R2R conversion technology

The M33 uses a genuine R2R DAC rather than a delta-sigma implementation. Resistor ladder decoding emphasises exact voltage transitions and organic timing, associated with an analogue-inspired sound signature. Selectable OS (oversampling) and NOS (non-oversampling) modes let users choose their preferred sonic presentation.

Fully differential 24-bit architecture

The four-channel differential 24-bit R2R array comprises dual 48-element precision thin-film resistor ladders per channel — 192 resistors in total — with 0.1% tolerance and 30ppm thermal variation. Tightly matched components ensure channel balance and phase coherence.