I've just recently got my set of IEM, but so far I'm pretty amazed how they handle metal, it's perfectly clean and not muddy at all imho, fast and precise even on not so great recordings. I've used to have XBA-Z5 and Hifiman RE-600 (on HM-801 and 901 DAPs) and they were far from satisfactory with this genre, I even stopped listening to most of my metal collection because of this, but WM1Z+Z1R makes me want to rediscover it again!
Example of the music I've tried it with
I like heavy metal when the mood hits me (Van Halen, AC DC, Ozzy, Metallica, etc.) but I have to be honest: I'm not critically listening to things like sound stage, instrument separation, bass timbre, etc. I just want a good loud electric guitar rift where the music is more important than my gear, ie., I can listen to heavy metal with my old iPods and I'll be happy.
But listening to jazz, pop, vocals, opera, classical, etc., I listen more critically which drives me to purchase more high end gear.
Maybe it's just me...
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