Darn, I was hoping that perhaps you might work out an order with Mark for the A45 in Cherry (since white or black was not your preference).
Did Mark say if he had listened to both in a good A-B setup or did you discuss the tweeter/highs in particular?
I am wary when somebody listens to speakers in different rooms or even an hour apart, so I try to compare at the same time. A lot of people overlook that we, as biological organisms are in many ways sacks of chemicals and our perceptions are not very consistent. As an analogy, good food tastes good, but go swimming for two hours and that good food will taste great! Similarly, if you spent the last two hours anticipating getting home and listening to a favorite song, it will probably sound better when you do than if haven't though about it until just before putting it on. A capable salesman will get you excited about a product before he even turns it on and you will likely perceive it as better because in an excited state we are just more alert/attentive.
I have not heard the reference series, so cannot speak specifically to it. The best Aliminium tweeter I have heard is in the KEF LS50. It is said to benefit from KEF's Blade, but I don't know how close it is to KEF's best (which might be assumed to be in the same realm as Canton's best?). I have to say it is the first Al tweeter I have heard that
never gave me any sense of break-up. However, I did not push them hard and only set them up at about 7' distance. They did not, however, have that last bit of high frequency detail that the Canton Ceramic tweeter offers. RAAL, Focal Be, and Canton Ceramic all fit into the same high level of quality to my ear. They have different character (especially because the Canton uses a significant waveguide while the others do not), but I consider them the best I have heard.
I like Snakeeyes thought:
Assuming you are integrating sub(s), the difference between 8" and 8.5" drivers is likely to disappear. In one of my most amazing experiences, I had
@TheWarrior over to listen to my tiny Vento 820.2 (1" tweeter, 6" mid/woof) vs RBH T1 (3 ea. 1" tweeters and 4 ea. 6.5" mid/woofs - it is big). I had these set up and had been listening to them for the past couple of weeks. My conclusion was that the Canton Vento had a better top end, but the RBH had a magnificent soundstage - enveloping me like nothing else I had heard. TheWarrior listened to the two speakers blind and simply liked the Canton better. When I asked him about any perception of scale or size he said "none". I was astounded, but closed my eyes and just listened as I switched back and forth, and sure enough he was right, the sense of the "magnificent enveloping presence" of the T1 was all expectation bias based on the visual dominance of the RBH T1. I gained a renewed respect for the influence of sighted comparisons that day.
Tim likes the 896 better than the smaller siblings (from another thread). I believe that is his experience.
However, here is what LowBeats magazine had to say about the Vento family
Es ist die wichtigste Linie von Deutschlands namhaftestem Lautsprecherhersteller: die Canton Vento S
www.lowbeats.de
Contradictions! - My guess is it is all about setup. If the speakers are close to the walls or corners, the 896's bass is likely to overwhelm while if they are pulled out into the room, the 876 is likely to sound anemic in the low end. Ultimately, the bottom line is these are all quality speakers with smooth response and although we ideally want speakers that sound perfect out of the box, these will give you the sound you want with small EQ adjustments. With subs, you can put the subs where they interact best with the room. With speakers, it is a gamble that the room interaction with bass frequencies will work well where speakers must be located for proper presentation at the higher frequencies.
Canton decided to upgrade the Al tweeter to Ceramic in one of their most premium line-ups. I don't think they did this without lots of thought. If I was spending the money, it seems to me the A 45 or Reference 5.2 are the best bets.