Grado's sound good plugged into an Asgard 3.
Good to hear!
Åsgard is probably a good choice
I must try Grado X a dayAgreed
The Drop Aeon Closed sound great on Asgard 3 - full tone on high gain.
I have also tried balanced with a THX789 - a little more open and detailed using medium gain.
I can't explain it, but as good as Drop Aeon Closed sound (very comfortable so I use them a lot while wearing reading glasses and marking), if I switch to the SR325X with Asgard 3 I end up listening to album after album and lose track of time... so inadvertently SR325X are a terrible headphone for marking.