Sennheiser - about the best..
I had a pair, they were brilliant, 1970's vintage. Not for hi-fi, but for ham radio morse use. Clear as crystal.
Thought 'Koss' was German, also but I'm mistaken.
Can't understand how folks are happy with these titchy ear-buds. Haven't found any that either fit well, or give any sound improvement improvement over a POTS telephone handset. Reviews welcome, natch.
Icon, 'cos he looks like he's wearing a pair. Or is it an iPod?