Thank you very much. They just arrived, I'm starting the hardcore testing program :D. The bass nobs are also bass ports? It's them I put tape on? 

Excuse my question, but which are the bass ports? On what do I put tape on? Mine just arrived and the bass is annoying me a little (the Fiio X5 might have its contribution to this). Thank you for your pretty straight review, it helped a lot.

Hello and thank you for the review. Could you please tell one or two songs which would underline the muddy mid bass over mids. I'm about to buy them and I want to make a testing playlist. Thanks.