Iv owned the Harbeth, many years ago. Great British speaker but the Quested Studio Active or passive version all sounded better to my ears with better resolution and dynamics but still kept a warmer smoother tone like the Harbeth. Don’t be fooled just because the Quested are being used in Studio they have the pedigree level to compete with many Audiophile speaker manufactures.
Have a look at the Quested H108 Speakers same monitors Hans Zimmer uses in his studio but i use the same speakers in my music room with OTL Amplifier.
Very musical speakers and very underrated, one reason is Quested don’t actively market their products like audiophile companies do with paid review magazines adverts.