room size required for Tekton double impacts

Room size is mostly irrelevant for monopole speakers.

Seating distance is a huge factor, you want to be far enough away so that all the drivers combine to sound like 1 speaker. From what I can find from manufacturer recommendations across brands, this happens at ~3x the distance of the drivers acoustic centers. Meaning, for the Tekton, if the top midrange is 40” from the bottom woofer (center to center), then you need to sit at least 120” (10ft) away to achieve optimal performance.