Those look like nice boxes for the small studio. At first it looks like they're 4 channel units, but it must be different sections for stereo, and the splits are how Behringer must have divided them.
A long time ago I had a Pioneer noise reduction box, stereo and split into 3 frequency bands, for the same reason as better compressors are split, for optimum dynamics without pumping the sound. I'd record FM stations on to open reel with no Dolby NR, then cut out the songs to cassette, with proper fades.
The Pioneer noise reducer was between the open reel and cassette recorder, so it lowered FM hiss and hiss from the reel, it worked pretty well. The cassette didn't sound so bad by itself without noise reduction, but when played on the air, the station's own compressors would bring up the noise again, so the noise reduction gave it a little more headroom on air.