Hi everyone, I'm having an issue with the Cozoy Astrapi which I recently bought and would like some advice. When I plug my Westone W10 into it, there is a high-pitched hiss in the background whether music is playing or not. It occurs when I play music through both Sony Xperia Z3 & Microsoft...

Do these get better after burning in? Just got a pair and vocals sound a bit muffled in both modes... wondering if this will improve over time.