Recommended operating temperatures for Ncore / Class D in general?

[Vacceo]

In terms of what types of coolers you'd use, agree. However, a CPU usually has a ton of heat (up to a few hundred watts) coming from a small area. A power amp needs to cool a larger area.

Luckily in this case seems like Nord has successfully coupled the amps to the case, so that blowing a bit of air around in the cabinet does the trick. That style of cooling is NOT recommended for CPUs

That's why I said in principle. Amps are easier due to less heat on a larger surface. However, it would be interesting to see a multichannel amp with coldplates for water-cooling, even if just as a project and experiment.

In day to day use, a fan rack is more than enough.

 

[Suffolkhifinut]

Operating temperature ranges vary dependent on the type of component. Here is a IRF-Z44 with the Operating Junction rating in degrees Celsius.
View attachment 230473

Think it was ambient temperature in my post. No doubt many component’s operating temperature far exceeds 20*C. One thing testing can’t tell us is the construction quality of any piece of kit, quite often leading to a shorter working life. As an example short signal paths on a circuit board are in theory a good thing, putting heat sensitive components too near a hot running component isn’!