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Class D amp long term reliability

Saying a Purifi 1ET9040BA sounds better than, say, an NC502MP is subjective and falls apart in the face of measurements when both are used within their designed limits.
But of course when one amp is pushed past its limits compared to one that isn't there can be audible differences (distortion, clipping), no one ever argues against that.
Kinda hard to push either past their limits in most domestic listening environments, though.

I know I could not tell apart a NAD M22 and a Benchmark AHB2 no matter how hard I tried, and that's cured me from trying to tell differences between top amps ever since, and kudos to whoever claims they can.
 
The exact same module can "fail" easily depending the build and task.

-take one and slap it in a small, thin case, it will only do as much.
-take the same and properly heatshink it according to its specs, it will do far more but at much heavier and bigger case.
-take one and actively cool it, you'll save weight and case real estate for the same as above performance but noise will demolish it's nice specs by 30dB.

Pick your poison.
 
I believe there are a sufficient number of reviews on this site revealing that “reputation” and “higher cost” do not necessarily correlate with better reliability, performance, or build quality.
While people want it all i.e. low price, high performance, high quality, and high reliability most realize there are going to be some tradeoffs. Also "performance" can be different things for different applications. Crown XLS amps are very high power, very reliable and very durable, but are also relatively high distortion and most importantly rely on noisey fans to realize their high output and reliability making them unsuitable for some applications but not for their intended pro use. The thing about Crown XLS amps is that they are very up front with what they are good at and what their limitation are and in general consumers are very happy with them. I think where these NC modules can run into trouble is that they are positioned as "just as good as" other high performance class D modules but with less power and cheaper. They don't mention part of the reason for being cheaper is because they are spec'd with lower grade parts and won't be as reliable or last as long as higher end modules.
 
Silent fans, we use them on 9-16CH, temp-speed micro controlled.

Horses.
Bimetal Temperature Switch at 70° C firing a fan otherwise inactive, may not be the worst idea.
 
"They don't mention part of the reason for being cheaper is because they are spec'd with lower grade parts and won't be as reliable or last as long as higher end modules."

If they sound as good where did you think they made compromises then?

It's not a conspiracy, less expensive is generally less capable, universal.

Priorities.
 
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Bimetal Temperature Switch at 70° C firing a fan otherwise inactive, may not be the worst idea.
Temp controlled, switch mode variable speed regulated, always idling alarm if stopped due to some fault.

And silent, as much as not noticable under normal conditions.

Are the fans on?
 
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Temp controlled, switch mode variable speed regulated, always idling alarm if stopped due to some fault.

And silent, as much as not noticable under normal conditions.

Are the fans on?
That's for nice ones, I talk about the ones who want cheap and maybe push them a little over their thermals dictated by the built.
Handy, 2 wires out of the switch which is near the heat, a fan, on board aux PSU used, done.
 
Silent fans, we use them on 9-16CH, temp-speed micro controlled.

Horses.
Can you share make and model of there fans? Are they 12 or 24 volt? Crown uses 24 volt which creates issues when trying to use 12 volt silent computer fans.
 
All the receptacles in my home (and the breakers) are at least 20 AMP. I did not do that, it came that way (built in 1972). I have not seen that in any other home in the USA that I have been in. But I have yet to cause a breaker to trip.
 
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