I don't think it's necessarily transphobic, but I also don't think you would still have that view if you had seen more trans men. You say you see them as "female-bodied", but some of the most insanely masculine looking men I have ever seen have been trans.
I remember I used to think I wasn't attracted to trans women for similar reasons and then I met more and started watching a few on youtube and instantly realized like "oh wait they are just normal women they look like women and act like women why wouldn't i be attracted to them" (which was then quickly followed by "oh wait i'm a trans woman", but that's a separate issue)
I'm no audio expert, but I feel like "audiophile headphones" and "headphones you can power directly from a steam deck" are probably mutually exclusive