The Sennheiser HD 505 get plenty more right than they get wrong, and as an object lesson in what (reasonably) affordable open-backed headphones can do for your listening pleasure, they’re pretty ...

The Sennheiser HD 550 open-back headphones are pitched as bringing "a compelling new choice to audiophiles and gamers seeking next-level capability". Sennheiser is talking a big game for the HD 550 ...