We are talking about "KZ ZSN Pro X" in-ear headphones. These buds exceeded my expectations. What I like best is that the frequency response is very balanced, there is nothing boosted or dampened. The highs are crisp and clear, the lows are smooth as silk with just enough "rumble" to keep everything reasonable. I listen to classic 24-bit 96kHz Hi-Res music and I listen to everything there is to listen to. Nothing collides, every detail that is in the recording is reproduced by these headphones. I use these earbuds with the LG V60, which is the best phone for audiophiles right now, and these earbuds make it even more obvious. So, if you're looking for in-ear headphones to use with a high-end portable audio player, these are the headphones you should consider. Since the cord is detachable on phones, it is available with or without a built-in microphone. I accidentally bought the microphone version. The microphone option is fairly cheap, so the microphone is the bare minimum for phone calls. It doesn't even offer vol+ vol- buttons. The cable itself is an ornament and looks classy, which matches the characteristics of the headphones. Another advantage of the KZ ZSN family is that you can also order a replacement Bluetooth cable. This turns wired headphones into networked wireless ones. The BT cable has an LDAC and AptX HD codec, while this is not a replacement for the cable, there is an option and it is a high quality one. I am attaching a photo (but to be clear this needs to be purchased separately). Back to the earbuds: they are shaped to fit and practically disappear in the ear. The included 3 sizes of rubber ear tips are pretty standard but when fitted properly they offer good blocking of outside noise but you can still hear small noises around you when not playing. The cable has a rigid over-ear loop that keeps the earbuds in place even during physical activity. I replaced the included ear tips with the T500 memory foam as it's more comfortable in my ears and slightly better at blocking outside noise. By the way, these are not noise canceling earphones. Active noise cancellation is probably not what you want if you still want to hear every detail available in whatever piece of music you're listening to. Overall I am very happy with the headphones, they exceeded my expectations, I don't know why they are priced under 25€, in my opinion they can compete with almost anything. I can't find any cons other than the fact that memory foam tips should have been instead of the usual rubber tips.
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