Also sent it back. Burning helps only partially, indeed, the already excellent bass has picked up, it has become more punchy and detailed. The upper frequencies are also reduced. But the main problem of these headphones lies not at all in this. They have the strongest dip around 300 Hz or so, and in general the frequency response in the midrange region has a strong slope. That's why I said about one-armed pianists, it seems that the part of the left hand is not performed at all, and the right hand is driven directly into the brain. Male vocals sound like the singer has inhaled helium. How this can be fixed with a cable or burning, I have no idea. It is possible that by replacing the damping something can be corrected, and something else, as it were, will not be spoiled. Sorry to admit, but I'm clearly not smart enough and brave enough to do it myself.