Whether or not you like the ATC sound they are objectively outstanding. The famous dome midrange has been measured by independent parties and they've published the results. I normally avoid getting personal but in case anyone happens across this thread and isn't familiar with the situation, kenjit wanders from thread to thread making bizarre and untrue claims that nobody should pay attention to.
Jeff Bagby reviewed the ATC dome midrange and did a bunch of measurements.
"Yes, in my opinion, on an absolute basis, this is an exceptional driver and one of the finest midrange transducers I have ever listened to or measured. The SM75-150S may be difficult to find and may be very expensive when you do find it, so it may not be a good value in everyone’s mind, but if you are looking for cost-no-object midrange performance then you may want to begin looking for a pair of ATC SM75-150S midrange drivers. "
http://studio-hifi.com/images/ATC75-150S_JeffBagby.pdf
John Krutke of Zaph audio also did some measurements that showed the same outstanding performance.
"Probably one of the cleanest midrange domes I've tested, with the lower midrange coming close to the noise floor of my measurement setup."
Sept 22, 2011
http://zaphaudio.com/blog.html
Jeff Bagby reviewed the ATC dome midrange and did a bunch of measurements.
"Yes, in my opinion, on an absolute basis, this is an exceptional driver and one of the finest midrange transducers I have ever listened to or measured. The SM75-150S may be difficult to find and may be very expensive when you do find it, so it may not be a good value in everyone’s mind, but if you are looking for cost-no-object midrange performance then you may want to begin looking for a pair of ATC SM75-150S midrange drivers. "
http://studio-hifi.com/images/ATC75-150S_JeffBagby.pdf
John Krutke of Zaph audio also did some measurements that showed the same outstanding performance.
"Probably one of the cleanest midrange domes I've tested, with the lower midrange coming close to the noise floor of my measurement setup."
Sept 22, 2011
http://zaphaudio.com/blog.html