Today we have two open-back contenders going head-to-head. The most expensive offering in Beyerdynamic’s DT line will take on a mid-level opponent from Sennheiser’s HD line: the 660 S. While not exactly the same price, the DT 1990 can occasionally be found on sale for $500 or less, landing both of these headphones in the “mid-level” audiophile category. If you’re looking for open-back, which of these popular faves should you go for?
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https://majorhifi.com/beyerdynamic-dt-1990-pro-vs-sennheiser-hd-660-s/
