OK:
1. Your chain of sound reprodcution contains
a) your computer
b) a cable from the computer to the Sarlett
c) the 2i4
d) a cable from the 2i4 to the speaker(s)
e) the speaker(s)?

Can you -- just for testing -- connect the speakers directly to the computer's internal sound card? Is the static still there?
Do you have a second computer, mabe a friends computer, to check if it is the Focusrite?
Did you change cables to check if there is a higher resistance somewhere in the signal flow?


Desktop; i7-2600k, 8 GB mem., Win 10 Pro, BIAB 2017; RB 2017 - latest build
Laptop: i5-2410M, 4 GB mem, Win 10 Pro, BIAB 2017; RB 2017 - latest build