its noise reduction settings. imho - same as c220: https://community.tp-link.com/en/smart-home/forum/topic/648234

К сожалению, есть мнение, что основной массе пользователей не понравится фоновый шум, а потому такая оптимизация вряд ли пойдет дальше бета-версии :( но сам факт - и микрофон и железо камеры...

I received firmware with optimized noise reduction, which does not distort the sound or cut off low-level sounds. In my opinion, this option is much better than complete noise suppression. It seems...

Updated Firmwares. C520WS - Much better sound! C220 - still not good enough :( New sound samples - https:// disk. yandex. ru /d/OWkTmFi45hwl-A (remove spaces)

Same videos on YouTube: https://youtu.be/PA0zOsPdSRY https://youtu.be/Ff1jtwD1_dg https://youtu.be/1AEQloBjfSI

Three cameras Latest firmware Simultaneous recording of street noise at the same point Plus the music turns on in the distance Microphone settings for all cameras - to maximum sensitivity Only C325WB...