FiiO K13 R2R Headphone DAC and Amplifier
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FiiO K13 R2R Headphone DAC and Amplifier
Overview
The FiiO K13 R2R is a full-size desktop DAC and headphone amplifier built around FiiO's own R2R resistor-ladder DAC. It's for listeners who want R2R sound with real power for demanding headphones, plus the flexibility to act as the hub of a desk or small two-channel system, with Bluetooth, a 10-band PEQ and balanced XLR and RCA line outputs.
FiiO's four-channel, fully differential 24-bit R2R DAC uses 48 precision thin-film resistors per channel, 192 in total, each with 0.1% accuracy and low 30ppm temperature drift. The whole chain, from DAC and filter to volume control and headphone amp, is fully differential, and two OPA1642 and two TPA6120A amp chips deliver up to 2400mW per channel into 32 ohms from the 4.4mm balanced output and 1220mW from the 6.35mm output. You can switch between NOS mode, which decodes at the original sample rate, and OS mode, which oversamples everything to 384kHz. A built-in 30W shielded switching supply, up to 18 low-noise LDOs and five DC-DC converters feed separate rails, and a 12V DC input lets you add an external linear supply.
Inputs cover USB-C (up to 384kHz/32-bit and DSD256 with native DSD decoding), coaxial (192kHz/24-bit and DSD64), optical (192kHz/24-bit) and Bluetooth 5.4 with LDAC, AAC and SBC, and MQA is fully decoded. The XMOS XU316-based 10-band PEQ works across every input and is set through the FiiO Control app or FiiO's web tool, with presets, auto-EQ and curve sharing. A 1.1-inch LCD shows sample rate, volume, gain and output mode, and you get dual knobs, an IR remote, three gain levels and three volume curves.
Simcoe Audio Video Insight
If Bluetooth will be a main input, check that your phone supports LDAC, since FiiO lists only LDAC, AAC and SBC for the K13 R2R. Keep in mind the PEQ works on signals up to 192kHz/24-bit, so leave it off when you want full 384kHz or DSD playback. Try both NOS and OS on music you know well and pick the one you enjoy. The XLR and RCA line outs make it an easy fit as a source or preamp for powered speakers or a separate amp.
More Info
Why the FiiO K13 R2R Stands Out
FiiO R2R DAC
192 precision resistors, fully differential, 24-bit.
2400mW Balanced Output
4.4mm output for hard-to-drive headphones.
NOS/OS Modes
Original sample rate or 384kHz oversampling.
10-Band PEQ
Set through FiiO Control, with auto-EQ.
Bluetooth 5.4 LDAC
Wireless input alongside USB, optical and coax.
XLR and RCA Line Outs
Feed powered speakers or an amp.
Buyer's Guide
Who It's For
- The R2R Listener Who Wants Wireless: Wants R2R sound plus Bluetooth.
- The Full-Size Headphone Owner: Needs up to 2400mW balanced.
- The Desktop System Builder: Wants XLR and RCA outputs for speakers.
How It Compares
Compared with the FiiO K11 R2R, the K13 R2R uses the same 192-resistor R2R design in a larger chassis with a built-in power supply, adds Bluetooth 5.4, a 10-band PEQ, an IR remote and an XLR3 balanced line out, and offers up to 2400mW balanced against the K11 R2R's 1300mW.
FiiO K13 R2R Headphone DAC and Amplifier Specifications
| General Information | |
|---|---|
| Model | FiiO K13 R2R |
| Brand | FiiO |
| Product Type | Desktop R2R DAC and headphone amplifier |
| Colours Available | Black, Silver |
| Audio | |
| DAC | FiiO four-channel, fully differential 24-bit R2R (192 resistors, 0.1%, 30ppm) |
| Hardware | SoC: ESP32-S3; USB: XMOS XU316; Amp: OPA1642 x2 + TPA6120A x2 |
| Modes | NOS / OS |
| Gain | Low, medium, high; 3 volume curves |
| PEQ | 10-band (up to 192kHz/24-bit) |
| MQA | Full decoding |
| USB | Up to 384kHz/32-bit, DSD256 |
| Coaxial In | Up to 192kHz/24-bit, DSD64 |
| Optical In | Up to 192kHz/24-bit |
| Bluetooth | 5.4 receiver; LDAC, AAC, SBC |
| 6.35mm Output (High Gain, OS Mode) | |
| Output Power | 1220mW+1220mW @ 32Ω; 1200mW+1200mW @ 16Ω; 150mW+150mW @ 300Ω |
| SNR | ≥117dB (A-weighted) |
| THD+N | About 0.0173% (1kHz/-6dB @ 32Ω) |
| Output Impedance | <0.4Ω |
| 4.4mm Balanced Output (High Gain, OS Mode) | |
| Output Power | 2400mW+2400mW @ 32Ω; 1200mW+1200mW @ 16Ω; 600mW+600mW @ 300Ω |
| SNR | ≥115dB (A-weighted) |
| THD+N | About 0.0173% (1kHz/-6dB @ 32Ω) |
| Output Impedance | <1Ω |
| Line Outputs | |
| XLR3 Balanced | 5.3Vrms; SNR ≥117dB (A-weighted) |
| RCA | 2.6Vrms; SNR ≥116dB (A-weighted) |
| Connectivity | |
| Inputs | USB-C (data) x2, optical, coaxial, Bluetooth |
| Outputs | 4.4mm balanced, 6.35mm, XLR3 balanced line out, RCA line out |
| Recommended Impedance | 8 to 350Ω (both headphone outputs) |
| Control | Dual knobs, IR remote, FiiO Control app |
| Display | 1.1-inch LCD |
| Physical Specifications | |
| Power Supply | AC 100-240V, 50/60Hz or DC 12V/≥2.5A |
| Dimensions | About 210 x 188 x 42mm (with feet) |
| Weight | About 980g |
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