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Hi, that's why I'm asking from other people that have NCx500 if it's "normal".
Tibor (from Apollon), and he's not the only one, told me that for the same price it was better choise to take an NCx500 amp (better price to performance ratio).
I just didn't think there was such a difference in heat with the Purifi (and in my case I only had 3 modules with a 1200W power supply compared to 5 modules here and a 3000W power supply that I have now).
People who haven't done the kill-a-watt measurements think since the NCx500 offers more power on paper than Purifi for about the same price, then the NCx500 is a better deal. They typically don't understand the Purifi builds are using almost half the power while idle and at normal listening volumes or don't consider that important.
Higher power use translates into more heat. You should always expect a NCx500 amp design to run warmer and consume more power than Purifi. I'm sure you noticed a big difference in heat between your Purifi amp and the NCx500. It's to be expected. More NCx500 modules translate to even more heat. It's simple math.