Listening to my modded 4-screw right now with the
@DekoniAudio Fenestrated Sheepskins and Elite Hybrids. I'd been using some ZMF Ori's with some felt dampening, but I think the thinner, less deep pads work better overall on the HE-6.
The 4-screws are of course a little brighter than the 6's and while I'm not super sensitive to treble, they can get a little fatiguing after awhile. The Elite Hybrids really seem to open the 6's up and give them a airy, yet detailed presentation. The highs are right in that sweet spot and it feels like I can listen to them for hours without issue. Bass quantity and impact does suffer slightly, but that's expected with these pads. The soundstage and imaging are just fantastic with the Hybrids. The presentation is very expansive and cohesive. Finally the comfort of the Hybrids is outstanding. Probably one of the most comfortable I've tried on the HE-6's.
Onto the Fenestrated Sheepskins. These are rather easy to compare to the Hybrids. It's basically like turning the knob to 11 and hold onto something. Bass response/quantity increases and soundstage isn't quite as big, so everything sounds more in your face. Treble is extended, right to the point where it was pushing my comfort levels. I listen to music rather loud (probably too loud) so this might not be a problem for some, but I'd probably get fatigued during extended listening sessions. Still, there's something to be said about the visceral quality this brings out of the HE-6's. Comfort is decent, but not nearly as good as the Hybrids or the thicker Ori's.
Overall I really liked both sets of pads and will probably just interchange them depending on what mood or music I'm listening to. Of course the quality is top notch and the included mounting rings are actually better than stock HiFiman rings. Wish I would have went ahead and got the regular Sheepskins and Velours, but even through Massdrop they aren't cheap. Perhpaps
@DekoniAudio can send me them so I can do a full write-up and comparison?
Also I can throw these on any of the early HiFiMan headphones (HE-5,HE-5LE,HE-4,HE-400,HE-500) if anyone wants to know how they sound.