I've also never heard of this.
These are open back headphones, which are designed to be open in the back…the closer I put my hands to my cups, the worse the sound gets. Most people even take the buttons off the grills, so more air will flow…you are restricting the air flow, which should not be for the better. If anything…try the hole mod on the back of the drivers, or the tape mod around the cushions for more bass.
:bigsmile_face:
Have you ever owned/heard the RS1i for enough time to say this? I do understand the 80i and the RS1i do basically share the same sound signature…but the RS1i will absolutely perform amazingly with a nicely matched amp. Not to knock the 80i in any way, they are excellent headphones, but I say this because I've listened to my 80i's through either my WA6/Lyr, and in no way do they sound as good as the RS1i's…the RS1i definitely benefits from the amping, where as with the 80i, its much harder to hear the advantage from amping IMO/IME.