I’ve just updated the Sony WM1Z to 3.1 firmware today, I love the SQ, I’m a basshead as well with the music I listen to. But I notice the vocals are more forward, it has crystal clear bass, it sounds great on direct source with well recorded music. It sounds good on SE with Sony MDR-1A2. 3.1 sounds similar to 2.0 on direct source.it has an wider soundstage.
Ok.. I thought maybe it had a wider soundstage as well but didn't really trust myself enough to say it lol.
I also agree that it sounds amazing with well recorded music. I love it with intimate folk vocals.
I don't use direct source though.. I always eq extra bass lol.