Just got my 4XX in the mail today.
How many hours of burn in is recommended?
I threw em in right out of the box because I couldn’t resist and they’re all right but they don’t touch my HD 650’s and this is my first planar I am mainly a IEM portable user 80% of the top but needed a couple different headphones for when I am at my desk using modi Magni 3
There's no such thing as headphone burn-in at least for planars (and electrostats).
Is this headphone a good upgrade to DT990(600ohm) bass wise ?? (Or how would it compare to them in general?)
It's an upgrade. Bass hits harder and has nicer texture and detail.