I was in the middle of an IEM/headphone shopping spree that started with OneMore QuadDrivers and decided I wouldn't take them outside for fear of losing them wanted to take such expensive headphones. Since then I've bought KZ ZSN Pro, KZ ZST X (those headphones) and Linsoul BLON BL03. They sound really good. They don't sound as good as the quaddrivers, which cost about 4 times as much, but are still pretty good. They are about the same as the ZSN Pro and in my opinion better than the BL03 which costs a bit more. The problem is that the wire keeps falling off the driver section. If I just take it out of my ears, one or both just fall off. I think you can glue them.
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