Tom, the 7 carbon tweeter looks different than the carbon tweeters in the 5a Carbon and the Quatro CT. For one thing, the latter two have a phase plug and look just like the Vifa ceramic-coated metal domes. My guess is the 7 uses a true "C sandwich" (like a radome), but the 5a and the Quatro use either a monolithic carbon dome or he coats the metal dome with one or two layers of carbon pre-preg, and then cures it.
In any case, what I'd like to know is how the 5a Carbon and 7 compare in high frequency, and whether the $1500 for the CT in the Treo is really a sonic improvement or just an expensive black coating on the regular metal dome tweeter.
In any case, what I'd like to know is how the 5a Carbon and 7 compare in high frequency, and whether the $1500 for the CT in the Treo is really a sonic improvement or just an expensive black coating on the regular metal dome tweeter.