Description
The FiiO M33 R2R brings resistor-ladder warmth to a pocketable Android platform. Under the hood, a Snapdragon 680, 8 GB of RAM, and 128 GB of storage power Android 13 for smooth streaming and local library playback. Two ESS ES9068AS DACs drive differential 24-bit resistor ladder arrays, while Flat and Warm sound modes offer two distinct tonal personalities. The M27-derived DAPS clock system — a high-capacity FPGA paired with dual custom femtosecond crystal oscillators — delivers flagship-grade digital audio purification in a 258-gram chassis. Balanced output reaches 1100 mW + 1100 mW in Super High Gain Mode, and the 10-band PEQ with AUTO EQ adapts to your headphone's curve. Multi-stage partitioned shielding ensures a silent background. Headfonia reviewers praise its mid-range realism and vocal presence, noting neither sound mode trades resolution for character. Includes a matching leather case.
Specifications
| Processor | Qualcomm Snapdragon 680 |
| Operating System | Android 13 |
| RAM | 8GB |
| Internal Storage | 128GB |
| DAC | Two ESS ES9068AS chips with differential 24-bit resistor ladder arrays |
| Audio Processing | XMOS XU316 |
| Balanced Output | 1100mW + 1100mW (Super High Gain Mode) |
| Digital Audio Purification | M27-derived DAPS (High-Capacity FPGA + Dual Custom Femtosecond Crystal Oscillators) |
| EQ | 10-band PEQ with AUTO EQ |
| Display | 5.5-inch 1080p HD (18:9 aspect ratio) |
| Battery Life (BAL) | 13.5 hours balanced playback |
| Battery Life (SE) | 15.5 hours single-ended playback |
| Fast Charging | Full charge in 1.5 hours |
| Dimensions | 138.2 × 71.5 × 17 mm |
| Weight | 258 g |
| Headphone Outputs | 3.5mm single-ended + 4.4mm pentaconn balanced |
| Other Outputs | 3.5mm line-out, coaxial-out |
| Bluetooth | LDAC |
| Storage Expansion | micro-SD up to 2TB |
| USB | USB-C 3.0 (charge + data) + desktop mode USB-C |
| Back Panel | AG matte glass |
| Frame | Aluminum with dual-beveled edges |
| Sound Modes | Flat and Warm |
| NOS/OS Modes | NOS (No Oversampling) and OS (Sampled) |
| Power Management | 15W system with 65A high-current MOSFETs and massive capacitors |
| Shielding | Multi-stage partitioned shielding (digital, R2R, amp, power) |
