- All cables are securely in place and correctly connected.
- Test away any interference devices, maybe the “noise” is possibly related to placement around some other audio gear (e.g. wifi repeater, phone).
- Try different power supply (e.g.Q4->plug it into a 5V 1A/2A adapter).
- If it has multiple input/output modes, try other modes to see if the issue persists.
- As for noise from headphone output, try to plug in a 3.5mm ground loop noise isolator and use a higher impedance headphone.
- Try to connect it to different sources, output (speakers and headphones) and well-shielded cables.
If you have any questions or concerns, please don't hesitate to contact support@fosiaudio.com.
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