BX5 D2 buzz and hum

Hi everyone,
this is my first post here :)
Anyways here is my problem. I have Scarlett Solo 2nd generation USB soundcard and BX5 D2 monitors. The soundcard has two RCA outputs for speakers and I use RCA cables to connect with the monitors using two TS adapters into TRS input of the monitors. When I disconnect the soundcard from monitors I hear the buzz (when the volume is all the way up), and when I connect the soundcard humming adds up to the buzz... The worse part is when I scroll the mouse for example and open Chrome or You tube etc...
Can you please help me?
Thank you!
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