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* Passive heat dissipation, no noise
* Use high quality PCM5122 DAC chip
* PCM5122 support Full-HD audio – up to 32-bit/384kHz playback ('''BUT pi 4 only support 24-bit/192kH192kHz''')
* Built-in high-quality audio headphone amplifier (TI TPA6133A)
* Class leading audio: 112db SNR, and THD of 0.0019%