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The Yuin OK1s are a pair of very high impedance earbuds, a normal earbud has an impedance of around 16 Ohms. The Yuin's impedance is a mighty 150 Ohms which makes them considerably harder to drive. This causes quite a bit of trouble because most normal DAPs do not have a good enough internal amplifier to drive them anywhere near their true potential. If you have a DAP with a good and powerful headphone out you can get them to sound fairly good. In order to truly let them shine you need to get yourself a decent headphone amp.

This definitely makes the Yuin OK1s a very unique niche product. By themselves they are portable, but if you want optimal performance you will have to carry around a small headphone amp, the latter is of course more of a hassle. If you like I appreciate good sound you will definitely want to have a headphone rig that includes a good portable headphone amplifier. The Yuin OK1 earbuds / earphones are roughly the same size as a pair of normal earbuds. That being said they are quite big for a pair of in-ears.

36:T7d5,Look, you want perfect sound, you need isolation from noise. For that you need an IEM, but anyone who spen