Nice, quality sound and good comfort. With recent price cuts, IER-M9 is a better value than it was originally. Slots between the IER-M7 and IER-Z1R in price, which frankly is why I chose it.
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Once you find the right ear tips, you'll notice a healthy bass response. It is always present, and even impactful when the track calls for it, but it isn't boosted to a level that makes these overly unbalanced or messy. Any more and the presentation would feel overly colored, but this means there are more fun headphones I've listened to. Bass guitar in songs is easy to find and separate from drums. Vocals are detailed and textured to a degree that I didn't think was possible. It's a whole new degree of livelihood in the singer's voices I can pick up on. But on some tracks, female vocals can sit ever so slightly too far back for me to properly enjoy them, hiding between cymbals and guitars. There is precisely the right amount of treble response. Any more and cymbals would start sounding hot and cheap, and crowding up the rest of the mix. Any less and I feel like the micro-details would be lost. M9's greatest strength lies in its details. The tiniest echoes and weakest reverb are noticeable. Not boosted, but present. Easily detectable, even if you aren't giving them your full attention. These headphones finally let me listen to poorly recorded music and enjoy it like I could beautifully-mastered music. They're so, so forgiving. I can only describe the presentation as dreamlike, and this can and this can be disorienting. I feel like I'm floating in space with nothing but sound by sound gently placed around me. It gives me shivers. I feel transported. 5/6.
Pros: - Extremely detailed - Great Separation - Great Bass - Great Lower Mids - Great Treble
Cons: - Upper Mids Lacking - Tips could fit better - Dreamlike quality to the sound
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