I did not audition anything other before building, because I knew I wanted a real soffit mount and all the benefits that they come with, and that was one of the reasons I even built a new room. There are not a lot of contenders in this space - there are lots of other options, but not many of them are fit for a propper soffit mount, and custom solutions quickly get out of hand in the quality vs price performance. And ATC is a no compromise company that have developed their speakers over decades, which means you’re not paying for 4-5 recent years of R&D, but for the utmost quality drivers. At least that is my experience.
To be honest, I think the only real contender I looked at was PMC, but they have decided to provide a similar product at 4-5 times the price, it doesn’t make sense on any level. I could/should maybe have ordered custom ATC subs, but I went for a sealed box to have the sub low end as fast and tight as possible. The 110’s really do extend deep enough that I could work without the subs though. There are a bunch of other large (sounding) studio solutions like Neumann, Genelec, Kii, Augspurger, Quested and Barefoot ( which is a joke, they sound absolutely horrendous), but I was not really in doubt when it came to a decission, since the 110’s are basically made for the job
the 25 and 45 is a little weird yes, but I understand the company’s effort to provide a smaller and less expensive solution.
My studio is in Copenhagen! I can’t remember the RT, but I know it is close to perfect for the designers target, except the HF is slightly overdampened. He is still developing the diffusers, it will come eventually
will see if I can find the measurements!