I haven't heard the Harbeth, but I have heard the Calibre several times. It seems that the 30.1 has stellar reviews, so it must be very nice to listen to. It looks like the Calibre will have more extended bass, if that matters.
Regarding sensitivity, the 30.1 is rather low, at 85dB, with the Calibre at 90.5dB, so the Calibre may be easier to achieve higher sound levels with lower watt amps.
Also, the tweeters are completely different(soft dome vs. Air Motion Tweeter) and that will come down to personal preference, and I would think extensive auditioning of both would be in order, prior to plopping down this kind of money.
BTW, if you ever get a chance to hear the Calibre powered by Raven Audio tube amplification at an audio show, you are in for a treat.
Regarding sensitivity, the 30.1 is rather low, at 85dB, with the Calibre at 90.5dB, so the Calibre may be easier to achieve higher sound levels with lower watt amps.
Also, the tweeters are completely different(soft dome vs. Air Motion Tweeter) and that will come down to personal preference, and I would think extensive auditioning of both would be in order, prior to plopping down this kind of money.
BTW, if you ever get a chance to hear the Calibre powered by Raven Audio tube amplification at an audio show, you are in for a treat.