You can usually buy the raw drivers. They'll cost you as they're handmade in Germany, but you can't beat the build quality or the sound quality. Rainbow invests a lot of money and labor into their products. If you can read German, you can look at the reviews in Autohifi magazine (under the German section of the Rainbow site) and see how the Rainbows stacked up. They don't have any reviews in English, so that's your only option. Anyway, to sum the Platinums up, they were:
43/50- Sound Quality
8/20- Maximum SPL
20/20- Equipment
10/10- Processing
The Platinums are excellent, the only thing they lack is extreme output. Anywho, I liked the Platinums tweets a lot better than the Utopia titanium and beryllium domes.
Take it with a grain of salt though, I am not a fan of the Focal inverted domes, for these reasons:
Really bad powerhandling
Doesn't like to be played low, and are aggressive as they get lower
Only good if on axis
Tend to be bright due to the rising impedance curve (<-zobel network would benefit that a LOT).
PITA to install.
Require tuning to get sounding natural.
Basically, add to the drawbacks of a ribbon tweet, take away some of the benefits, and you have the Focal inverted dome. Sorry Focal fans, jmo
