The IX4’s fans are quite loud and always spinning the same speed whatever the temperature may be inside your NAS. In this guide, I will lower the fan speed and quieten your NAS. Make sure to test these settings thoroughly before applying them as setting the speed to low may cause your NAS to overheat during long operations.
Temperatures can be checked from the WebGui under “System Status”:
Fanspeed can be checked under the “Fan” tab: