Description
The FiiO M15S is a high-end portable audio player for listeners who want desktop-grade sound on the go. It features the full-size ESS Sabre ES9038PRO DAC—the same chip in FiiO's flagship M17—paired with a Snapdragon 660 and custom Android 10 that disables Global SRC for bit-perfect playback. Stream via AirPlay, cast from Roon, or load 384 kHz FLAC files onto the 5.5-inch display.
The M15S's defining feature is its desktop/portable dual power supply architecture. Connect a QC or PD fast charger to unlock Ultra High gain mode, delivering up to 1200 mW per channel through the 4.4 mm balanced output. In dedicated desktop mode, disconnect from the battery entirely—the included DK3S heat dissipation dock manages thermals for extended listening. Five gain levels, a refined analog volume wheel, and digital volume buttons provide granular control, while DAPS Digital Audio Purification System and a 4th-generation FPGA with dual NDK femtosecond crystal oscillators maintain a clean signal path.
With 10.5 hours of battery life, QCC5124 Bluetooth 5.0 supporting LDAC and aptX Adaptive, and a full accessory bundle including a leather case and PD charging cable, the M15S delivers a complete audiophile experience.
Specifications
| DAC | ESS Sabre ES9038PRO (8-channel, 4 per channel differential) |
| SoC | Qualcomm Snapdragon 660 (4×2.2 GHz + 4×1.8 GHz) |
| RAM / Storage | 4 GB / 64 GB (~46 GB user) |
| Display | 5.5″ IPS, 1440×720, 300 PPI, 88% screen-to-body |
| OS | Custom Android 10 (Global SRC disabled) |
| Bluetooth | QCC5124, BT 5.0 (TX: LDAC/LHDC/aptX HD; RX: LDAC/aptX Adaptive/aptX LL) |
| WiFi | 2.4/5 GHz, DLNA, AirPlay, Roon Ready |
| Headphone Outputs | 3.5 mm SE, 2.5 mm balanced, 4.4 mm balanced (Pentaconn) |
| Balanced Line Out | 2.5 mm + 4.4 mm (shared with PO ports) |
| Coaxial Digital Out | 3.5 mm (up to 384 kHz/32 bit/DSD128) |
| USB | USB-C 3.0 (charge / data / OTG / USB DAC) |
| Battery | 6000 mAh |
| Battery Life (SE) | 10.5 h (3.5 mm, 32 Ω, screen off) |
| Battery Life (Balanced) | 9 h (2.5 mm + 4.4 mm, 32 Ω, screen off) |
| Charging | QC3.0 / QC4.0 / PD2.0 / PD3.0 via USB-C |
| Gain Levels | 5 (Low / Medium / High / Over-ear + Ultra High in desktop mode) |
| Balanced Output (Ultra High, 32 Ω) | ≥ 1200 mW + 1200 mW |
| SNR (Balanced) | ≥ 121.5 dB (A-weighted) |
| THD+N (Balanced) | ≤ 0.00075 % (1 kHz / 32 Ω) |
| Clock Source | 4th-gen FPGA + 2× NDK femtosecond crystal oscillators |
| Amplifier | OPA926 × 2 |
| Native Playback | Up to 384 kHz/32 bit / DSD256 |
| USB Audio Input | Up to 768 kHz/32 bit / DSD512 |
| MQA | Global 8× decoding |
| Dimensions / Weight | 140 × 80 × 18.9 mm / 345 g |
| Color | Black (matte CNC aluminum, Gorilla Glass front, polygonal coated back) |
| Operating Modes | Android / Pure Music / USB DAC / Bluetooth Receiver / AirPlay / Roon Ready |
| EQ | 10-band dynamic (±12 dB), 8 presets, custom |
