I'll leave the description to the pros, here's from Michael Fremer's review in S&V:
"But when you have identical, big, nearly full-range (rated 38 hertz to 50 kHz) speakers that sport the aforementioned X-ART tweeters, the resulting seamless and expansive front sonic picture is sensational. Sometimes nothing sounds worse than driver technologies that clash within the same box. Often if you pair the sonic particulars of a ribbon tweeter, for example, with a cone woofer, it produces obvious discontinuity. However Adam accomplished this, it’s managed to seamlessly blend the X-ART tweeter with the coned midrange and woofer.
Whatever colorations this system may have were so well hidden, I found myself unable to assign it a position on the bright/dark scale, the hard/soft scale, the thin/rich scale, or the forward/recessed scale. If these speakers have any gross faults, I couldn’t detect them. I found the overall response, at least observationally, to be impressively wideband, smooth, and free of obvious dips or bumps. The system was open, clean, and dynamically effortless on both the micro and macro ends of the scale. It rocked, and it exhibited delicacy and finesse. If the GTC77 system has any weak points, I don’t know what they are. If I were forced to assign it a sonic character, I’d say it’s slightly but smoothly forward."
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