ATI AT543NC recent user feedback?


There are measurements for the AT524NC model from here : https://www.soundandvision.com/content/ati-at527nc-and-at524nc-amplifiers-review-test-bench

Quoting: 
"Into 4 ohms, the amplifier reaches 0.1% distortion at 377.2 watts and 1% distortion at 475.5 watts."

This seems very good to me. I am guessing AT543 will be very similar if not very different. The AT54XNC amplifiers use two N-Core modules per channel in a differential bridged output configuration delivering 500W RMS per channel at 8 ohms and 900W RMS at 4 ohms.

What is differential bridge output is that better for THD or does it make it worse?.
geek101