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FiiO K11 Compact Desktop DAC and Headphone Amplifier
Product Description
The FiiO K11 combines a fully-differential 24-bit R2R DAC array with a dedicated headphone amplifier in a compact desktop chassis. It uses a four-channel, fully differential R2R resistor array (48 resistors per channel, 192 total) with 0.1% accuracy and low-temperature drift to deliver a clean, low-noise background and crisp output. Users can switch between NOS (Non-Oversampling) and OS (Oversampling) modes, with NOS preserving the original sampling rate and musical character, while OS oversamples to 384 kHz for added detail and clarity. The amplifier section features TI OPA1642-based low-pass filters and dual SGM8262 amplifiers, delivering up to 1300 mW per channel and three gain levels for pairing with sensitive IEMs or high-current headphones. A precise NJW1195A digital volume chipset provides accurate level control with low inter-channel distortion. Dual headphone outputs include a 6.35 mm single-ended and a 4.4 mm balanced jack. The unit supports high-resolution PCM and DSD (DSD256 in native mode) via internal PCM processing for R2R, and employs a multi-channel, low-noise power supply comprising 17 LDO regulators and 2 DC-DCs fed by an external 12 V supply.
Product Details
| R2R Architecture | Fully-differential 24-bit R2R DAC array with 48 resistors per channel (192 total) and 0.1% accuracy |
| Operating Modes | NOS and OS dual modes with loudness/clarity trade-offs; OS oversamples to 384 kHz |
| Amplifier Circuit | TI OPA1642 filters and dual SGM8262 amplifiers; up to 1300 mW per channel; three gain levels |
| Digital Volume | NJW1195A precise digital volume chipset for low-distortion control |
| Outputs | Dual headphone jacks: 6.35 mm single-ended and 4.4 mm balanced |
| Power | Low-noise power supply with 17 LDOs, 2 DC-DC converters and external 12 V supply |
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