My old DT770-250 was just about falling apart after years of faithful service, and didn't gave the details and translation I wished for; they didn't have added value compared to the main en near field studiomonitors (Neumann and Genelec). After some extensive listening and comparisons between the closed Beyer 1770, 700ProX and the Ollo s4r I bought these! The HD620 give a more neutral and relaxed sound and a slightly better soundstage experience compared to the rest (IMHO). Layers in music were more visible/defined. These Sennheisers don't have the WOW effect, they are flat and neutral sounding. They lack some punch in the presence and the boosted highs (mount Beyer) compared to het Beyers and some accuracy and speed in comparison to the Ollo, but for longer listening sessions the 620's are more preferred because they give less listening fatigue and due to the somewhat more laidback highs and presence they give some more insight and space in the mix. the mix translates beautiful to all sort of systems! These can easily be used for Hi-Fi listening to I guess, they sound a lot like the old HD650; the 620 does give some more low end. The headphones sit firmly over the ears (directly out of the box maybe somewhat to firm), within a couple of weeks they get more loose, then it's ok. The earpads close very well around the ears and the build quality is solid enough compared to the old Beyers. Highly recommended for professional studio/live use!
