B8 is a closed headphone, but it could still be considered semi-closed/open. also, imho b8 definitely belongs to hifi quality headphones, hifi doesnt only mean that it must be close to neutral or the closeness of the audio to the source, but also the quality of the audio reproduced. technically in the world of audio, hifi means 2 things. accuracy and audio reproduction quality. .but the first part is hard to do. replicating the original source has not been done since we invented headphones. theres no headphone in the history of headphones which is capable of reproducing true neutrality and accuracy. but hey, we also invented equalizer, that may solve your issues with neutrality.