Constantine Soo's Dagogo zine just published a review of the Sound Lab Ultimate 545 electrostatic speakers in which he makes reference to the size of the radiating surface and the size of the room. Dr. Roger West of Sound Lab is quoted:

“My calculations show that in order to achieve proper acoustic balance with the [Ultimate 545’s] the listening room should not have a volume greater than about 2400 cubic feet. In contrast, your room has a volume of nearly 3800 cu. ft. However, the speakers are mounted on the narrow aspect of the room and thus low-frequency energy travels on a “corridor” past the listening position, somewhat like a wave-guide, which could increase the energy density of bass energy and somewhat offset the maximum room volume requirement."

The full review can be found here:https://www.dagogo.com/sound-lab-ult...kers-review/2/