Great neutral IEMs with excellent detail, soundstage and bass that keep me happy. I haven't tried the cassette mod which seems to boost bass and treble. The only issues I had with these headphones were that the cord was a bit longer and the design of their insertion in the back was odd. The second issue which is the main reason for 1 star less is that sometimes it's a crappy shot to get a seal on and using different attachments that aren't included makes the sound completely different. Otherwise I'm happy with what I've gotten so far.
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