Dont plug your apple macbook into circuit near audio
I have been at work in another state
I took my air book which normally sits on my audio armchair
When I cam back and listened to my system without air book I was shocked
It was like the biggest upgrade to the system ever
Replugged in airbook, the whole thing collapsed
I now have on different circuit
Not sure whats going on but to quote an audiophile clique the difference was "night and day"