Okay, I have both the HD820 and HD800S. I combine them with the Chord Hugo 2. To my ears, these are very different headphones in terms of sound. My original plan was to get an HD820 and sell my HD800 but after hearing the HD820 I couldn't get rid of the 800, why? because they give you a completely different experience. The HD800s are more technical and detailed headphones with a very large soundstage - the HD820s are more musical, more intimate and the music sounds closer than the HD800s. that doesn't mean the soundstage is small, no, the soundstage is very large for closed-back headphones. Even for open sounding headphones I've compared them to the HD650 and the HD820's soundstage sounds huge, not as big as the HD800, but in return you get a tighter sound and punchy bass that goes really well with music like hip-hop and House/Techno fits. with HD800-like clarity and detail. They're both very technical, the HD800 is a bit more detailed but thinner and brighter so I ended up keeping both.
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