Ok the stock pads we all have give the most treble but have the least comfort. the hm5 pads seal better, slightly more comfortable, slightly better bass. The nvx angled pads give noticeably more bass BUT at the expense of treble. These earpads give these already dark sounding cans an even darker signature. (!)
The Stax pads are by far the best in regards to comfort and sound balance but cost almost as much as the headphones themselves.