I heard almost all Harbeths from 1st gen p3 onwards (currently own 7 and 5 in a same room) and to my ears, just let you know how I feel, there is no best among them. All are excellence. The main different among them is their presentation. All play natural sound and musics as good as live and I always feel only real live healthy unamplifeid musics or acoustic instruments or human voices can do better. 5 give more bass due to it's box, high is equally natural but a little bit more obvious compared to another, the mid is relax while 7 or 30 mid can sound a bit more dense. In short 5 is looser and 7 or 30 is tighter. For some music, say piano violin duo, all give healthy illustration of soundstaging, weighty and plenty of natural harmonic decay, the presentation on 5 is a bit more laid back, 7 and 30 are a bit more forward. Some people love 5, some people love 7 or 30 and never like 5. For me, by using same source and same amp in a same room, when listen to 7 i never miss the 5 and when listen to 5 i never miss the 7. If you already love Harbeth sound and can not do demo on all Harbeths, my suggestion to you is just get a pair which is best for your pocket and room size well do. Either pair is excellence natural musics maker.
"Bath in Music"
Harbeth owner since 2004