Tmsorosk - Thanks for the insights. But I am a little confused (which is not unusual). It looks like the 532H is a new development for home theater. It is lighter, it is optimized for quick, high peaks (according to ML literature) and does not double down. If it is based on the 432 technology, it looks like they made some significant changes to it.
The 53 is a switching design that uses MOSFETs for its output stages. I do not see any reference to either of those technologies in the No 532 literature. The No 532 looks more like it is a traditional design, updated to be fully differential. Do you have any reference to the No 532 using the 53 technology?
I heard the 53 with the big Revels, but unfortunately it was in their traveling truck. The "accoustics" made it difficult to really evaluate them. I have not heard the No 532.