I am using a FiiO Q1 mk 2 velcroed to the back of my iPhone. If I have wi fi switched on I am plagued by static and buzzing . I have to move the device a good 3/4 inches away to steer clear of it . Is there any material ( maybe foil or something) that could sit between the two ? To shield the amp ? I have not stacked devices before , it doesn’t surprise me that it picks up the interference but I thought it was designed to be isolated from it ? Any ideas would be appreciated! Thanks !