| Name/Model | K13 R2R |
| Hardware solution | SoC: ESP32-S3, DAC: FIIO-developed R2R DAC, USB decoding: XU316, AMP: OPA1642*2+TPA6120A *2 |
| Working mode | USB DAC mode/Coaxial decoding mode/Optical decoding mode/Bluetooth receiving mode |
| Color | Black/Silver |
| Weight | About 980g |
| Dimensions | About 210x188x42mm (including feet) |
| Gain | L/M/H |
| Remote control | Supports IR remote control (only the one included in the accessory) |
| Volume control | Knob/Remote control |
| FiiO Control | Supported |
| Driver-free mode (switch mode) | Supported |
| Bluetooth receiving (5.4) | SBC/AAC/LDAC |
| Oversampling setting | OS/NOS |
| PEQ | Supported |
| MQA | Supports MQA full decoding |
| Knob indicator light/Top ambient light | Supports customizing brightness and color, and supports always-on indication or RGB pulsing |
| Display | 1.1-inch LCD |
| Screen status indication | Sampling rate, volume, gain, output mode, etc. |
| Coaxial decoding: 192kHz/24bit; DSD64 | XMOS firmware: Upgrade through the side or rear USB-C port |
| Optical decoding: 192kHz/24bit | Bluetooth firmware: Upgrade through the FIIO Control app |
| Knob | Volume knob with button*1+Menu knob with button*1 |
| USB port | Type-C USB*2 (Data transmission port) |
| Digital coaxial input port | RCA plug |
| Digital optical input port | Optical port |
| Balanced output port | Standard 4.4mm port |
| Headphone output port | Standard 6.35mm port |
| Balanced line output port | XLR3 balanced port |
| Single-ended line output port | RCA port*2 |
| Toggle switch | Power toggle switch |
| Power supply | AC 100-240V~50/60Hz; DC 12V/≥2.5A (either-or) |
