Diamond drivers

Diamond tweeters are for real. While they do make for good marketing and unfortunate price increases, they deliver.
I have owned the following loudspeakers over the last ten years: B&W CDM1, CDM2SE, CDM1NT (Aluminium tweeters), Jamo Concert 8 and 11 (Silk dome tweeters), 804S (Aluminium tweeter), 803D and 803Diamond (Diamond tweeters).
As context for my observations: I am very sensitive to any tweeter harshness.
I like the silk dome tweeters, but not so much Aluminium dome tweeters - they tend to have a residual metallic sound. The better Aluminium versions will only occasionally highlight a distortion artefact, as opposed the less accomplished versions which are almost unbearable after a few minutes.
However the diamond tweeters are clearly superior: better transient response, cleaner, more precise sound-staging, transparent to quality of recording and audio equipment, consistent sound quality across their frequency span. And yet they are easy on the ears - I can listen for hours without fatigue to the 803D and 803Diamond loudspeakers.
I have heard many other loudspeakers at dealers with different tweeter technologies including Beryllium and Ribbon. I haven't heard anything at dealer that would indicate an obvious weakness with the B&W Diamond tweeters. However, as always, a definitive comparison will require extended home auditions.

You are right about the pleasant sound of the Diamond tweeters. But there is more than only the tweeters. The biggest problem B&W has is that they still not make great filters. Wenn you do a test for depth and how wide the stage is, B&W is quite poor. This was the main reasson why I did not want to continue with B&W. I owned the 802N and 800S. The new series still have this problem. Depth ann a wide stage are one of the most excitings parts of highend audio. Wenn this is not that exeptional good, you miss a lot of excitement during listening to your favorite music.

Dracule1
I think the new diamond mid/bass driver is ground breaking. No one else has done what Raidho has with diamond. But I will hold off on judgement of the sound until I hear the D1.

Ground breaking indeed and a complete sonic treat. I have the Raidho D-Series under audition at home at the moment and I maintaining a blog that can be found HERE. Raidho is the only company of Know of that builds its own diamond coated bass woofers.

@Kiwi_1282001

Very interesting and much appreciated! As I'm seriously considering the Raidho D-2 or D-3, I will read and follow the development of your thread carefully.

Off topic, perhaps, but in respons to poster Jwm:

I heard all the Raidho speakers at CES 2013 and was not impressed. It is a favorite of Valen's which means hifi sounding and it sure is.

I once owned the Raidho C1.0's(w/upgraded Raidho binding posts), and while my main issues with their sonics may not address your "quibble" on Raidho speakers sounding "hifi," based on your recent CES impressions, I'm guessing my own impressions carry strong remnants of "hifi"-sound that applies to your usage of the term.

I could start out by asking what you mean with speakers sounding like hifi, but what rubbed me the wrong way with the C1.0's was a noticable lack of energy or "aliveness" in central areas. I would describe them as extremely elegant sounding, unfluttered, well-balanced, highly resolved, and quite composed - though on the verge of (or rather trespassing the line of) being a bit dull-sounding. By 'dull' I mean a certain lack of dynamic expressiveness as well as the lack of ability to make me "feel" the fabric and palpable quality of the music, as if being robbed the unwarnished rawness of the sonic material at hand. Moreover Raidho speakers in general have struck me as having perhaps a tendency to emphasize spatial information that makes it feel slightly unnatural at times.

Within the realm of the more or less "typical" hifi-speakers above named issues may not be that prevalent, and there are certainly qualities found in the Raidho speakers' sonics that makes them the preferable choice in many cases here, but my latest(i.e.: last two years) endeavors with compression driver-fitted waveguides and pro-style paper-coned 12" woofers have made a huge difference in addressing my complaints aimed at the Raidho's(and hifi-speakers in general), radically tilting the sound away from the (to my ears) too smooth and "dull" imprinting. Now to be found is instead a dynamic explosiveness, "ignition" at lower levels, the sense of real instruments and voices being played, scale in spades, and not least the overriding feeling of effortlessness - very, very important, to me at least, in setting the music free and making it sound real. I gather these traits go somewhat contrary to what is usually seeked and cultivated in the hifi-domain in general.

Put shortly the Raidho's became too cultivated, too spacious, and too dull and smoothed out to my taste, and my main reference in coming to realize this was the frequent attendance of live, acoustic concerts - in tandem with a gut feeling. Hifi has veered off too strongly to become cultivated and tamed, and while Raidho has made efforts to avoid exactly that I believe their course has yet to address it properly. Somehow I doubt expensive diamond cones will make any significant changes to this signature, and that the tendency is instead linked to the overall implementation of the product.

Just my 5 cents...