Either I've only just noticed, or it's only just broken somehow, but the left speaker on my 3DS seems quite a bit louder than my right. If I place my finger over each speaker, the left one definitely produces louder, clearer sound. A little Googling tells me this may be a fairly common problem but there's no fix. Anyone here have the same problem? Perhaps it will be possible to adjust the balance between the left and right speaker in the future with homebrew.