Where can we buy those?
My (unmodded) AD700 (no X) does not have a foam disk, only the thin screen on the ear pad. I do not own an AD700X, and I do not know whether it has a foam disk there.
Just use them naturally till you feel that they're at their best. Normally the burn-in time is about 50-100 hours, maybe 200 or more. On my AD1000X it was about 50 hours, but we've debated a lot on burn-in and now I'm not even sure if it exists at all.
Lol I'll let you know, except it's been years and I'm using a different amplifier.
Also I had the ad2000, not the ad2000x.
Trigger pulled though, should be a great match for my old bel canto dac2 > mf x-cans/psu system.
Better than trying yet another hd650 anyways