hi guys, this is Grace from AAW. We have received numerous report that on low impedance and high sensitivity iems, capri produces a noticeable hissing. Unfortunately, even we tried, it is an issue that software isn't able to fix. however, we have developed a hardware fix on the amp circuitry. For the units that hasn't shipped, the fix is already applied(though there maybe some 1.2m mmcx variants which is already on their way, that has not had this fix). This fix will reduce hissing by approximately 70% on a 16ohm, 112dB spl iem, which is already very hard to detect.
If you are using a high sensitivity iem, you are welcome to sent it back to retrofit it. such fix is of course free of charge, but your will be liable for any shipping cost incurred in between. Do email
support@aaw.me to arrange, thanks!