FiiO
K11
interface_dac
$130
Used market: $80*
Specifications
4 of 10 values have a recorded source- Type
- DAC/Amp Combo·
- Bus Powered
- no·
- Max Gain dB
- 0·
- Analog Inputs
- ·
- Analog Outputs
- 6.35mm Headphones, 4.4mm Balanced Headphones, RCA Line Out·
- Digital Inputs
- USB-C, Optical SPDIF, Coaxial SPDIF·
- Min Usb Power W
- 0·
- Headphone Output
- Max Power mW: 520 · Max Voltage Vrms: 4.24 · At Impedance ohms: 32 · Output Impedance ohms: 1.2·
- Max Sample Rate kHz
- 384·
- Phantom Power Provided
- no·
Expert Audio Engineering Commentary
Headroom Notes
FiiO gives peak-to-peak volts rather than Vrms: 12 Vp-p single-ended, 24.5 Vp-p balanced. Converted, that is 4.24 and 8.66 Vrms, and both agree exactly with the 300-ohm power ratings in the same table — a rare case where a manufacturer's numbers are internally consistent. Runs from a 12 V wall adapter, so USB supplies data only.
Amplification Warning
Output impedance is 1.2 ohms single-ended and 2.4 ohms balanced. For 300-ohm headphones that is irrelevant; for a 16-ohm IEM the balanced jack is the worse choice despite being the more powerful one.
* Estimated with the depreciation fallback (~62% retained value). · checked on 8/5/2026