The FiiO DM15 R2R sits at the top of FiiO's portable CD player range, succeeding the DM13 with a more refined feature set and a bespoke R2R DAC at its heart. It is aimed at listeners who want the convenience of a portable CD player alongside the warm, organic character of ladder DAC conversion, with enough output power to drive a wide range of headphones directly.
Five-Core Architecture
The DM15 R2R is built around five integrated modules: a CD servo mechanism, a high-performance USB DAC bridge, a proprietary R2R conversion stage, a Qualcomm QCC3095 Bluetooth transmitter module, and a dedicated MCU (microcontroller unit) that coordinates all five. This modular approach allows each section to be optimised independently, and means the R2R DAC stage handles audio from both CD and USB inputs.
Custom 24-Bit R2R DAC
Central to the DM15 R2R is FiiO's own fully differential, four-channel R2R resistor ladder DAC. It employs 192 precision thin-film resistors, 48 per channel, selected for 0.1% accuracy and a low temperature drift of 30ppm. The design operates via an FPGA-controlled serial-to-parallel conversion stage that feeds the R2R ladder arrays for the R+, R-, L+, and L- output channels. The aim is a nuanced, warm, analogue-flavoured presentation that recalls classic portable CD player sound, without sacrificing contemporary clarity.
Output Power and Headphone Drive
Single-ended output from the 3.5mm socket delivers 315mW per channel into 32 ohms, a 66% increase over the DM13. The balanced 4.4mm Pentaconn output reaches 1,150mW per channel into 32 ohms, representing a 74% uplift. This substantial headroom makes the DM15 R2R capable of driving demanding full-size headphones directly from battery power.
USB DAC and Digital Features
The USB-C input functions as a HiFi-grade sound card, supporting PCM up to 384kHz/32-bit and native DSD256. In USB DAC mode, audio is processed through the same R2R stage as CD playback. The unit can also rip CDs to WAV format on connected USB storage simultaneously while playing the disc, making it straightforward to build a digital library from physical media.
Bluetooth Transmission
The Qualcomm QCC3095 chip enables aptX Adaptive, aptX HD, aptX, and SBC Bluetooth transmission from both CD and USB audio sources. A redesigned pairing interface displays Bluetooth device information clearly on the built-in display, simplifying wireless headphone connection.
Equalisation and Sound Presets
Three BASS modes and eight built-in EQ presets combine to create up to 24 sound combinations. A dedicated RETRO preset is included for a richer, more analogue-flavoured response. Playback controls include mechanical buttons, a traditional volume dial, and an infrared remote control.
Portability and Power
A 4,700mAh lithium-ion battery provides approximately seven hours of CD playback. Electronic skip protection is included for portable use. A Desktop Mode bypasses the battery circuit when the unit is powered externally via the USB-C port, reducing wear and maintaining consistent output when used as a desktop source component. The tempered-glass lid allows the spinning disc to be seen during playback.
