I own and still use, at times, the ATC-20/2's. They are remarkable for their clarity and drive. The down side is these speakers are unfailingly neutral. Bad recordings sound... well bad. Great recording sound... amazingly great. Admittedly, I never found a great tube preamp to use with them to tune out a little of the neutrality. Previously I owned the SCM-12's which are not powered like the 20/2's. I liked these better, as I was able to select the amplification to use. Just my two cents.
Jim
Jim