Overheating is sometimes linked to using the DAC with high-sensitivity IEMs at high volumes or using poor-quality USB cables. 2. Immediate Fixes & Workarounds Increase Buffer Size:
If you own a pre-built dongle (like the Abigail, JCALLY, or similar CX31993 sticks) that gets hot, you can improve its heat dissipation by linking the chip directly to its aluminum shell.
This prevents the chip from idling at high bias currents when your media is paused. Summary Troubleshooting Checklist Primary Cause Recommended Fix Continuous USB polling / OS upsampling
Before reaching for a soldering iron, confirm the cause. cx31993 datasheet fix hot
| Metric | Stock CX31993 | +75Ω Adapter | |--------|--------------|---------------| | 8kHz peak (into 12Ω load) | +5.2dB | +0.8dB | | Ultrasonic noise (20–100kHz) | -65dBV | -78dBV | | Listening fatigue (10 min scale) | High | None |
In Windows Device Manager, find your USB Audio Device / CX31993 entry.
: The USB-C connector or dongle body feels hot to the touch, often followed by a gradual buildup of static noise or a sudden disconnect. Primary Causes : Overheating is sometimes linked to using the DAC
Does the heat cause , or is it just uncomfortable to touch ?
Some firmware implementations of the CX31993 do not aggressively enter low-power sleep modes when audio stops playing. Unplug the dongle from your phone or laptop when you are not actively listening to music to save host battery and let the hardware cool down.
For desktop use, attaching a tiny passive aluminum heatsink to the DAC body can significantly lower temperatures. Understanding the CX31993 Specs (Summary) Based on commonly available technical specifications: Specification Interface Type-C to 3.5mm Sampling Rate 32bit / 384kHz SNR DNR THD+N 0.0003% (95dB) Output Thrust Amp Type Conclusion This prevents the chip from idling at high
Go to Control Panel > Sound > Device Properties > Advanced. Change the default format from 32-bit/384kHz down to 24-bit/44100Hz or 24-bit/48000Hz .
The has established itself as one of the most popular budget digital-to-analog converter (DAC) chipsets on the audiophile market. Celebrated for its ability to deliver premium ultra-high-resolution audio—boasting up to 32-bit/384kHz PCM decoding and a 128dB signal-to-noise ratio (SNR) —it powers countless ultra-portable "dongle" DACs.