That is a good question. It's actually quite possible that the D30R weren't fully burnt in since the dealer said they hadn't listened to them yet.
I certainly agree with you that they have achieved something special with the ribbon tweeter, and it didn't have any of the flaws I associated with that kind of deign. Dispersion was good, both lateral and vertical, and they didn't seem to have a narrow sweet spot. (Although of course, after a year with Quads, most speakers seem to have a wide sweet spot).
The D40R has twin bass drivers, so that might make the difference. I do seem to be finding that floor standing speakers with a single bass driver can achieve deep bass, but are often a little lean in the mid-bass. At least that is what I found with the Devore Super 8s, and I'm told the 88s are similar. But it may be that the D30R properly burnt in would loosen out in this area. I would get a home demo, but as it stands I'd prefer to spend money on a new phono stage when I'm enjoying the Harbeths. Perhaps in a few months time.
I certainly agree with you that they have achieved something special with the ribbon tweeter, and it didn't have any of the flaws I associated with that kind of deign. Dispersion was good, both lateral and vertical, and they didn't seem to have a narrow sweet spot. (Although of course, after a year with Quads, most speakers seem to have a wide sweet spot).
The D40R has twin bass drivers, so that might make the difference. I do seem to be finding that floor standing speakers with a single bass driver can achieve deep bass, but are often a little lean in the mid-bass. At least that is what I found with the Devore Super 8s, and I'm told the 88s are similar. But it may be that the D30R properly burnt in would loosen out in this area. I would get a home demo, but as it stands I'd prefer to spend money on a new phono stage when I'm enjoying the Harbeths. Perhaps in a few months time.