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The new amplifiers is getting warmer and hot

Why the newer amplifiers / AV Processors and receivers is getting more warmer and hotter than the older versions ?
i have 2 1990s amps citation 7.1 and harman Kardon signature 1.5  runs cool compared with my current Parasound A21+
128x128lordrootman
noromance's avatar
noromance
9,709 posts
 
But doesn't Class D run cooler? More likely that the heavier, more expensive to build heat-sinking capacity is reduced in the newer amps along with more heat tolerant components which allow them to run hotter without damage.
erik_squires
16,009 posts
 
The Parasound A21 is A/B. I had the original, and they ran warm.  I measured the wattage, and as I recall, the idle power was 2x spec.

The other two I believe (but I am not Google) are class D.
dorningarts
18 posts
 
The A 21 does run a few watts in Class A which will make it run warm
lordrootman's avatar
lordrootman OP
373 posts
 
@erik_squires  no I’m not comparing class D 
why the newest amplifiers ,AVR , AV processors run warmer than old school ones ?
lordrootman's avatar
lordrootman OP
373 posts
 
I know a lot of people is using mini fan on AVR like Marantz Onkyo Denon etc.... I don’t think it was like that in 70s-80s and 90s 
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