I know you'll think i'm nuts, but if you use a massive surge protector with your Magni, try it without. Don't think about it, just do it.
Unplug it when not in use.
People can say i'm hearing things all they want, but the Magni and all my other amps sound best without one
The differences are much easier to hear on closed and somewhat bassy/warm headphones.
I switched surge protectors and thought I fixed the problem, but apparently not.
BTW it's not an issue with the amp. All my amps degrade with a surge protector. Don't know why.
Some more than others. I can't detect an ounce of difference with my Q710 or fairly neutral open headphones.
When I have my Micro plugged into a surge protector and use the HD-650, the low mids are too forward and the soundstage is compressed.
The bass gets a bit bloated too. Sounds noticeably less clear.