Here is a summary of the other mods: SDR only is fine (applied to the HD800) and I consider this with the SBAF to be among one of the best mods personally. The SDR tames the 5.5-6kHz peak. The SBAF liner brings up the scooped mids. (hmmm). The HD800 + SDR + SBAF (BTA) still sounds a bit hot in the mid-treble and up. The main problem is finding an HD800 these days. SBAF (BTA) liner can improve localization with less diffuse sound, but at the expense of expansiveness. Cork mod and Vader mods similar in that more absorbing material is used. Less bright then above #1, but still a bit bright - remember, I dislike bright and if anything prefer a darker signature. The downside with using material is slower transient response. The HD8XX isn't as bright as the above (and again still needs proper placement of putting the driver as far ahead and low to the ear). It also fully retains HD800 transient response. However the downside is scooped mids starting earlier than before at 800Hz and deeper in amplitude. I am fine with such a 1.5 octave scoop centered at approximately 2.5kHz. Whether you are or not I cannot say. Also, the HD8XX doesn't have such a thick bass presentation like HD800S - the bass presentation is closer to that of the drier HD800. So if you want a bassy HD800, which most people I've met say they prefer, the HD8XX will not be it. In a nutshell: Not a bassier HD800(S). Bass presentation not as thick as HD800S (less third order) and more similar to OG HD800. Maintains transient response, the attack, bite, and "snap" of HD800(S), which cork and Vader mods do take a bit off. Not as bright as HD800(S), but instead a midrange scoop with a tiny bit of emphasis is lower mids. Same expanded slightly diffuse headstage as HD800(S). Lower bass extension than HD800. Nothing like HD650 (in case you wanted this comparison!) Personally, I do not need another headphone. However, but nothing has headstage like the HD800(S). It's the only headphone which is capable of projecting a stereo image 4" in front of my eyes instead of 0.5" in front. (Speakers can project a soundstage past the wall depending upon my sources and gear). The HD800 even beats SR1a in most aspects of headstage.