I run the Classic Audio Reproductions T-3. It is set up with dual 15" woofers, has 20Hz-45KHz bandwidth, nice flat impedance curve, 97 db 1 watt/1 meter and matches the transparency and detail of the best ESLs with its field-coil drivers. Nuance, bandwidth and efficiency all in one package
That is like a custom studio main monitor design - this is serious stuff - only the highest quality drivers period. And four 15" 1602 TAD woofers to boot! I could live with these and be in heaven - although I have not heard them the driver pedigree is enough to know they must sound awesome - unlike anything else - outside of a prestigious studio...
I don't doubt you when you say you get the bottom end impact that most speakers (including ATC) only hint at! (Certainly true for ATC's domestic line which stops at one 15 inch woofer and ATC tend to be voiced bass light)
How about a pair of these ? Now 8 15" TAD woofers in one room is sure to knock one's socks off - as well as precipitate the filing of divorce papers! Wonderful stuff - drool, drool...