One more thing to consider regarding your questions about crossfeed with the Clear (or any other headphone for that matter), which is that it’s possible to experiment with it using software, depending on your source.
I use my Mac to output lossless audio through Soundsource from Rogue Amoeba software, and the CanOpener Studio audio plugin from Goodhertz. This plugin works for both Macs and Windows, but I have never used it with Windows so I can’t speak to that part.
The plugin allows you to experiment with crossfeed, with lots of customization options as desired. Since it’s software, you can use it with any amp.
Going this route allows you to try it with different recordings, and see whether it adds or detracts for the “realism” of what you’re listening to. With some music it is a positive change, and sometimes neutral or negative. It’s interesting to play with, and reminds me of a Headroom amp I once had that had crossfeed, but this is much more customizable.
Fwiw, I’m in the Schiit contingent, with a Bifrost 2 DAC feeding a Lyr 3 and Asgard 2. I love my OG Clear using either amp, and the Clear scales really well. The Lyr 3 is a beast which will drive almost anything, and from all I’ve read is a better pairing with something like the Clear, as it is a bit less analytical than something like a THX amp.
Have fun! 