Reply to Question about using KRKs with two inputs

I have a quick question about the KRK RP 5s.

I want to route my Scarlett 2i2 into the 1/4 inch jack of the KRKs and use the XLR inputs to connect wirh my S4 (using an adapter to fit the 1/4 inches of the S4).

Is that possible without damaging anything? Of course I would unplug the sound card that is not in use from the computer every time.

Thanks in advance for your help!