Wrapping up
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We have not tested KZ’s planar and electrostatic models (yet); needless to say we are very curious! Also worth mentioning is that the Bluetooth module also works surprisingly well, especially on the iPhone. It will be down to the Bluetooth protocol, but with our Oppo (Android) phone we suffered from dropouts in crowded places like railway stations. The module is a kind of lightweight ear clip that bends around the ear and to which KZ’s IEM can be connected. Very handy to have this option; you hardly feel the Bluetooth once they are on. For around 20 euros for the basic model (there are more options) a no-brainer.
After hearing six models, we can only conclude that KZ makes IEMs that offer incredible value for money. For 15 euros, the ZSN PRO is amazingly good. We know IEMs that cost 100 euros or more; the ZSN PRO wins hands on. KZ also seems to master the balanced armature technique. Want more bass? Then choose a model with a conventional driver. More high end? Try a model with more BA units, or the planar and electrostatic models. Indeed, the hybrid variants offer, as promised, a combination of sound characteristics. The modest price makes it tempting to buy a few and try them out.