If you are still experiencing issues, or want to know if a specific pair of IEMs pairs well, let me know: What are you plugging the dongle into? What headphones/IEMs are you using? Share public link
Are you experiencing a specific issue like , disconnects , or low volume ?
The CX31993 is not a bad chip; it is a great chip trapped behind bad documentation and lazy OEM integration. With these fixes, your $10 dongle will outperform most $50 "audiophile" portable DACs. cx31993 datasheet fix better
Users often report that the CX31993 can sound overly bright or "thin" with certain headphones.
"CX31993" refers to the chip itself. "CX PRO" is a marketing term typically used by AliExpress sellers to denote a dual-chip implementation (including an amplifier). Unless the product listing explicitly shows the MAX97220 chip, the "PRO" label means nothing. If you are still experiencing issues, or want
Ensure the digital ground (DGND) and analog ground (AGND) meet at a single star-ground point underneath the chip to prevent return loop currents from infecting the audio signal. Fine-Tuning for Better Audio Performance
This is perhaps the single most-reported problem with CX31993 dongles, particularly when the dongle is connected to a PC with an AMD GPU or a gaming motherboard. The CX31993 is not a bad chip; it
Users often report static or distortion at low system volumes on Android.
If the audio sounds flat, the dongle might be drawing insufficient power, or the firmware is optimized incorrectly.