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  1. fumanshu

    Hifiman RE-600 and after that?

    Hi I would like to know and have your opinions. I'm using right now a Hifiman RE-600 with my Astell & Kern AK Jr + Vorzûge Pure ii+. I would like to upgrade my iem but I don't know what should I buy. I already have a Grado GR8, Shure SE 215 and just acquired a SE425 but I find the sound very...