Pro Studio relates to the paint treatment I requested and a larger resonator than the original design. My speakers were voiced to accommodate my cavernous room. It is 20'w x 35'L with ceiling starting at 12' going to 16' at peak. Horns can have a tendency to be extremely bright and forward. In my case, the sound will be slight less forward which is perfect for my room. I will be able to maximize my low level listening when combined with my Canary Audio Grand Reference 125wpc 300B tube amps. By the way, the Amps have a combined 16 300B tubes. Having a massive 18" subwoofer will provide me a perfect complement of bass.
As soon as I receive and hook up all of the new equipment I will be providing a detailed analysis.