johny_2000, even though Sennheiser HD 800/800S has large drivers unfortunately its thin earpads are designed to give you less than perfect/loose seal which significantly reduces the quality of subbass (with 10db bass boost to EQ it to Harman target curve you will hear subbass presence but you will not really feel it, your head will not be vibrating). I think you'd better try some planar headphones that offer very good seal and are known for detailed sound/high resolution and bass slam when EQed to Harman/similar curve. Audeze LCD-X, if I'm not mistaken, is often recommended for bass, and LCD-5 for smooth and perfect treble and high resolution with carefully done EQ. I would recomend you to find a store that has in stock as much as possible Audeze and Hifiman headphones to listen to, and go there and listen to them using Oratory's PEQ settings, and you will probably find the headphone that sounds great to you. Price of the headphones doesn't really matter when you use EQ to boost low frequencies on planar headphones, what matters is unit to unit variation and perfect seal, so your goal is to find a comfortable planar headphone that matches its average/smoothed measurments to get the best sound/subbass with ready-made PEQ settings from Oratory's page on reddit (try more than one unit of the same headphones, they all sound a bit different). I also suggest you to download Sonarworks 4 which has many Audeze profiles, you may prefer their 5 or 6db bass boosted curve over Harman because it has more warmth and slight subbass rolloff, and later on order an individual headphone calibration to benefit from the perfect channel balance and more accurate measurments on your planar headphones. As a free alternative to Sonarworks you may try ToneBoosters Morphit vst which has its own headphone calibration target curve as well as Harman curve, and it supports many other headphones, which Sonarworks didn't measure, like Hifiman edition XS and Arya Stealth (but as always it's a bit hit and miss with averaged measurments, but still a free decent alternative to Oratory's PEQ settings).