| Name/Model | K13 |
| Hardware solution | SoC: ESP32-S3, DAC: ES9039Q2M*2, USB decoding: XU316, AMP: OPA1642*2 + TPA6120A*2 |
| Working mode | USB DAC mode/Optical decoding mode/Coaxial decoding mode/Bluetooth receiving mode |
| Color | Black/Silver |
| Weight | About 960g |
| 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/LDAC |
| Screen status indication | Sampling rate, volume, gain, output mode, etc. |
| PEQ | Supports 10-band PEQ (PEQ is not available when using digital output) |
| MQA | Supports MQA full decoding |
| Knob indicator light/Top ambient light | Supports customizing brightness and color, and supports always-on indication or RGB pulsing |
| Coaxial decoding: 192kHz/24bit; DSD64 | Bluetooth firmware: Upgrade through the FIIO Control app |
| Coaxial output: 96kHz/24bit (USB decoding only) | BAL: 8~350Ω |
| Filter settings | Supports 8 filter settings |
| SHR (Second harmonic regulation) | Supports 4 settings |
| 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 (Input/Output) |
| Digital coaxial output port | RCA plug (Input/Output) |
| Balanced output port | Standard 4.4mm port |
| Digital optical input port | Optical port |
| Balanced line output port | XLR3 balanced port |
| Headphone output port | Standard 6.35mm port |
| Toggle switch | Power toggle switch |
| Single-ended line output port | RCA port*2 |
