According to the reviews, the tweeter is indeed from the ScanSpeak line. Model not identified, but as Jason says, any of these ScanSpeak tweeters are top-of-the-line.

I've never had a chance to hear these speakers as to their nearest dealer is about 75 heavy-traffic miles away. The company has an excellent reputation and the reviews refer to details such as separate sub-cabinets for the main components that are usually found only in even MORE expensive speakers, or in custom cabinets. I would also note that, while acknowledging that the OEM price must be considerably below "retail", the drivers in the Beethoven would cost you around $1,000 a pair and the crossover, which from the description clearly uses high-end components, probably $300-$400 a pair for parts alone. So all in all, a much better-than-usual ratio between retail finished price and retail component cost.

From my own experience with speakers using similar drivers, I too would recommend the "small" setting, crossover set no lower than 60 Hz and perhaps even 80 Hz. For one thing, if you have a subwoofer, I believe taht the overall clarity and detail from your main speakers is audibly enhanced by leaving the really low frequencies to a separate unit. For another, when one looks at objectively measured frequency response curves, one wonders by what measure these speaker companies make their claims for low frequency response. (To be fair, a company that was honest and objective in their products' anechoic bass response probably would have a hard time selling its products).

Having previously criticized Def Techs, I'm sure these Vienna speakers are immensely superior, but to be fair, they are, what? 5x? 6x? in price over the unpowered Def Techs too.