I read them perfectly fine, and I double check the result using another IEM. As I said, my M4 sounds normal, as with the IEM I used for double checking.
You forget that, with IEM, everything will play 'inside' your head. That test is designed for speaker, not IEM.
You forget that, with IEM, everything will play 'inside' your head. That test is designed for speaker, not IEM.