I wanted to give the company a chance to exchange a set of cans before I made some conclusions about this pair. I bought a set nearly a year ago, and at first thought they were pretty solid. After some tests I was wrong. The buzzing and rattles became apparent. I did everything possible, every online trick etc. Nothing fixed the issue, especially in lower and lower mid registers. I just got my exchange unit, and they are not burned in, but the horrible buzzing is present but in slightly different frequencies, worse really. Just a warning about the quality control of the lower models. I was going to buy a Sundara or XS but I will not buy any more Hifiman ever. My replacement pair cannot be used and buzzes so much it is basically trash. Unfortunate.