ls50's are not bright as an innate characteristic, but their metal dome tweeter can certainly be excited to play harsh and bright treble with amplification or source that offends in this way
in this case, the arcam integrated is the offender... among the british integrateds, arcams are well known as the zippiest, leanest, most strident sounding ones -- so together with the ls50’s this is not a good combination if what is being sought is a natural dimensional sound with some warmth, fullness and body to the music
in this case, the arcam integrated is the offender... among the british integrateds, arcams are well known as the zippiest, leanest, most strident sounding ones -- so together with the ls50’s this is not a good combination if what is being sought is a natural dimensional sound with some warmth, fullness and body to the music