ieales
The variations can be small, but they will vary with every load presented. Hence, the perceived sound of the amplifier can vary with each speaker.
This Stereophile image of PS Audio’s Stellar M-1200 shows it well damped and relatively immune to load variations. https://www.stereophile.com/images/1220PS1200fig01.jpg
Ditto this Schiit Aegir https://www.stereophile.com/images/919SchAegirfig01.jpg
Not so much this new Mytek Brooklyn AMP+ https://www.stereophile.com/images/421Mytekfig01.jpg
Making a purchasing decision based on the written word is folly. Doubly so for fan-boy recommendations.
I’m not knocking Class D. I have one driving the woofers in my tri-amp system.
Yes and you have to remember all those measurements are made using Stereophile AP Aux-0025 low pass filter
Stereophile:
All measurements are made AUX-0025 passive low-pass filter between the amp and the analyzer.
The Audio Precisions Aux-0025 is a very steep low pass low power filter filter between amp and analyzer which makes things look even better than what they really are. Used in all the Stereophile measurements in the last 10 years.
Without it before (Stereophile got the filter) things looked much worse, but showed was what was "really coming out of the speakers terminal" they looked like this, (same amp) what you get is the 1st picture when buying the amp. (switching frequency noise evident)
https://www.stereophile.com/images/1212AM1fig02.jpg When the Stereophile AUX-0025 filter was put in place they look like this
(switching noise filtered out by Stereophile’s test filter)
https://www.stereophile.com/images/1212AM1fig03.jpg not what you get when buying the amp.
Solution to rid the switching noise in the audio band, and it’s by product phase shift:
Raise the switching frequency 3 x so to the amps output filter, then the switching noise will also be reduced by 3 times , so to the unacceptable hf phase shift, like this Icepower 1200as2 in red
https://ibb.co/kMZd9bF Like Technics do with their SE-R1 Class-D and some say the SU-R1000 integrated also.
Cheers George