I had the Rheas and the Ribbon was not bright at all. If anything it was smooth and a little laid back. Very natural presentation. The Alta are not about super resolve, they are more about portraying music. I have sensitive tinnitus ears, so brightness or edginess is a big NO NO.
Alta Audio speakers--anyone heard them?
Here's another relatively little-known speaker manufacturer.
http://alta-audio.com/collection/
Anyone heard the Titanium Hestia's?
(Where do they get these names?...)