Her character is that she doesn't want to stand out because she gets embarrassed easily, that's why she plays bass to begin with and not any other instrument, because you know bassist don't matter. Perhaps she doesn't want to hear her own playing and get embarrassed by it lol.

I pulled out my K-On albums went through them, surprisingly the K701 have a very clear bass and a good enough amount of sub bass with these HTT songs. Honestly, I wouldn't mind rocking these if I were Mio. It's not like my DT 770 Pro but I would say it sounds good for a bass head. I like bass guitars but I don't play them, however I can definitely transcribe what's going on in the bassline with the K701. The soundstage is so wide that the bass doesn't get muddy in with the crazy drum riffs Ritsu was banging out, truly impressive.