Is my Aune X1S too bright for headphones

Alright looks like I have my path layed out for me. Thanks for your inputs, I’ll let you know how it goes…

Cheers!

Not every tube amp is necessarily warm sounding. Maybe keep some budget left over to switch to high quality Russian tubes.
Personally, I would rather connect a tube preamp to the x1s and then use a powerful SS amp.

Yes, experimenting with nos tubes can help get sound to how you like it

In this case, he has a pair of 6xx which I think would work really well with an otl amp imo, as a tube preamp and solid state amp might be more subtle imo

Sennheiser are great with tubes, I just wanted to show an alternative way that also likes Planar.
But must admit the price of the darkvoice 336se is unbeatable.