I am using GMA Europas in a space 35'x75', firing crosswise. They're supplimented with a single, active Tyler 12" subwoofer. Without resorting to too many adjectives, I can say that the Europas are the finest speaker I have personally experienced. The accolades they have received here and in other forums are deserved. My recent past includes Vandersteen 2ce and Tyler Taylo Reference Monitors.
Although the soundstage is wide and deep in the traditional listening position, the qualities inherent in the time-aligned, phase-coherent design of the Europas are present regardless of where I am in the space. They are truly impressive at ALL sound levels.
I was so intrigued by these speakers that I sold my previous system and built my present system entirely around them. Associated gear: Edge M8, Edge T3, NAD541i, Ack!Dack, Discovery IC's and cables. A minimalist system that continues to amaze and improve.
Contact me directly for adjectives.