1) For about 15 years, it was believed that the HD600 is the standard. When a person first gets acquainted with open dynamic headphones after reading reviews, he usually finds the HD600 sounding great (I fell into their ranks at one time). However, those who have other more expensive headphones in the "zoo" such as the Beyerdynamic Amirone, 1770PRO, ATH 1000-2022 series, as well as isodynamics, will find these senshi too boring. HD650s have more bass, 660S are already more balanced and I would recommend paying attention to 660S. 2) Headphones are extremely comfortable and ergonomic. Easy to take off and put on. 3) The peculiarity of these ears is that the nature of the sound changes little on different sources. I would recommend sources with pronounced, sharp and dynamic high frequencies to compensate a little for the "deafness" of these ears. I liked the sound on the Creative AE-5. 4) I wouldn't say the HD600s are oaky, most modern in-ear amps drive the HD600 easily. It is clear that a built-in or external ZK with USB power is not suitable here. 5) Sometimes I use it to listen in the background.
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