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| Specification | Detail |
| Product Model | HiBy FC4 |
| DAC Architecture | Dual ESS Sabre ES9218PC |
| Clock Oscillators | FPGA-Based Dual Independent Crystal Oscillators (45.158MHz / 49.152MHz) |
| Decoding Support | PCM up to 768kHz/32-bit, Native DSD256 |
| MQA Support | MQA 8x / 16x Unfolding |
| Digital Input Interface | USB Type-C |
| Headphone Output Ports | 3.5mm Single-Ended (SE) & 4.4mm Balanced (BAL) |
| Output Power (3.5mm SE) | 110mW @ 32Ω |
| Output Power (4.4mm BAL) | 340mW @ 32Ω |
| Output Level | 1.9 Vrms (3.5mm SE) / 3.3 Vrms (4.4mm BAL) @ 32Ω |
| Signal-to-Noise Ratio (SNR) | 120 dB (3.5mm SE) / 123 dB (4.4mm BAL) |
| Total Harmonic Distortion (THD+N) | 0.0008% (3.5mm SE) / 0.0006% (4.4mm BAL) |
| Frequency Response | 20Hz – 90kHz |
| Controls & Indicators | Hardware 30-Step Volume Buttons, Multi-color RGB Status Light |
| Body Material | All-Metal Construction |
| Dimensions | 65.3 x 22.1 x 11.9 mm |
| Weight | 21.7 grams |
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