4 screw vs 6 screw impressions Got a stock 4 screw a few days ago, did the full mods (new pads, blu tak and regrill). And yeah the 4 screw is better than the 6 screw, And having blu tak is much better than without. Blu tak Blu tak not only improves the bass, with better clarity, detail, tightness, extension and subbass impact (at the expense of mid bass impact). It also improves imaging and and deepens the soundstage. The stock 4 screw, is less clean, has worse bass and a shallower stage vs even the modded 6 screw. But when the 4 screw is modded, it's a different story. But before I get into the comparison, there are a few things I need to point out. Pre impression notes 1. The 4 screw's headband clamps harder, so while that's less comfy, but also improves the seal which makes the comparison a bit uneven. 2. Since I don't have 2 pairs of the same pads, I had to swap the same pads back and forth to give a fair comparison. But that also meant that a/bing the two headphones wasn't quick. The pads I used was the ori pads with some foam at the rear of the pads to increase the pad angle which improved the soundstage. 3. I think the 6 screw has slightly more subbass, but that's probably due to the fact I used dollar store tak for the blu tak mod and as a someone that doesn't really do diy, I might not have applied the blu tak as well as the person the previous owner bought the 6 screw from. **edit: forgot to say this but my setup is PC > Eitr > Audial Model S mk2 > Mcintosh Mc2505 Impressions The 4 screw sounds more explosive, has a deeper stage, has more resolution and air. It has overall better micro and macro dynamics and offers a more black and vivid blackground with transients being sharper and less rounded. Though make no mistake the 4 screw still sounds more rounded and liquid than something like a hd 800. So yeah the modded 4 screw is better than the 6 screw in pretty much every way. However with it's increased dynamics and less warm and rounded sound, I find a bit more fatiguing and it's probably not as pleasant vs the 6 screw for the "warm butt" people. The 6 screw tends toward the audeze sound, while the 4 screw tends toward to the hd800esq sound. To be honest I'm actually surprised that there could be that much of a difference. If the 6 screw makes other planars sound like "playnars". The 4 screw does the same to the 6 screw. I've always thought the he-6 was a step behind the likes of the utopia and hd 800 in terms of dynamics, clarity, separation and resolution. With the 4 screw I can safely say that it matches in terms of dynamics and improves in the other categories to the point that it's only a half a step behind.