Bluesound Node 2i & KEF LS50 wireless hum/buzz


Hi - 
I recently purchased a BS Node 2i to connect to KEF LS50 wireless speakers. I keep receiving a hum/buzz when playing through Tidal. Has anyone else has this problem?
I have the BS connected via RCA in order to use the DAC in the BS. I've changed interconnects, power cords, outlets, used a Furman power conditioner, just a wall socket, all plugged in the same socket, etc..., and nothing seems to work. 
Bluesound support is a joke. No phone number and I've sent emails roughly a week ago with no response. The outlets in the room were all installed last year and are all grounded. Any help would be appreciated.

skoorb824
I’d at least try using digital out on the Node and see if that clears the hum. Also, try attaching a ground wire between the Node and the KEF’s. 
No, the hum is constantly on. I lowered the volume of the Node and it's still there.  I tried all of the cables that came with the Node, unfortunately a digital cable didn't come with and I don't have an extra. I'd like to use the RCA's to hear the difference between the two DAC's.
I've changed outlets again and tried a cheater plug, to no avail. Not sure what else to do here. 
Not really my forte, but how would I attached a ground wire between the Node & the KEF's?