Because they don't have a bright tweeter, don't have grainy midrange, don't have "ear grating" types of distortion. Most high end speakers hurt the ears of many sensitive listeners who are bothered by rough/harsh/bright distortions. Most Harbeths have subtractive faults which don't hurt that type of listener's ears. If anything they are missing detial, missing extension, which does not typically hurt ears.
I don't own Harbeths, never did, never had any sort of business with them in any way. But I know what I have heard from most Harbeths, and have had many occasions to hear them.
I don't own Harbeths, never did, never had any sort of business with them in any way. But I know what I have heard from most Harbeths, and have had many occasions to hear them.