I have a Crack with speedball, HD 650, MacBook Air, Tidal, and RCA to 3.5 double shielded cable (tried 2 different of the same brand, a 3 foot and 12 foot with no difference). I have 2 different kinds of interference. One sounds like radio but non stop talk that fades in and out. The other sounds like a faint router that fades in and out. Moving to another position or room seems to improve it for a little bit. The interference is primarily in the left channel. If I unplug the RCA from the source (my laptop or phone) I still hear it but if I unplug the RCA from the crack it stops and is dead quite. The interference is very quite but after listing for a while it becomes more noticeable, I don't think its getting louder just more noticable. I live in an apartment in the city so there is a lot of opportunity for interference. Any thoughts on fixing it?
Thanks
George