Electronics > Projects, Designs, and Technical Stuff
Class D amplifier distortion measurement filter
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David Hess:

--- Quote from: dashpuppy on August 24, 2019, 02:07:37 am ---I've heard so many Class D amps and they all sound Meh!  Whats wrong with a nice Class a/b or A ?
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Most people will not notice the difference in performance but can immediately appreciate the increased efficiency of a switching amplifier.
GregDunn:

--- Quote from: SiliconWizard on August 23, 2019, 08:16:39 pm ---
--- Quote from: GregDunn on August 23, 2019, 08:06:47 pm ---I don't care about harmonics past 20 kHz, because they're inaudible anyway

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They may annoy your dog.
 ;D

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Cat.   ;D  But neither the source material nor the speakers go much, if any, above 20k, so I'm not too concerned if there is junk >60dB down.  I have seen a distortion plot for the amp elsewhere, but (a) I'm not sure if I trust the originator, and (b) I'd really like to see what I get when I do the band-limited measurement.
GregDunn:

--- Quote from: David Hess on August 24, 2019, 07:19:52 pm ---
--- Quote from: dashpuppy on August 24, 2019, 02:07:37 am ---I've heard so many Class D amps and they all sound Meh!  Whats wrong with a nice Class a/b or A ?
--- End quote ---

Most people will not notice the difference in performance but can immediately appreciate the increased efficiency of a switching amplifier.

--- End quote ---

I haven't done a blind listening test on the amp (Crown XLS series) but it does an excellent job of driving my inefficient speakers with tons of headroom, and it does consume about 1/4 the power under no-load conditions.  I'm perfectly satisfied with the result and love the system - it's certainly doing everything I hoped.

Personally, I'm of the opinion that a modern amplifier, properly designed and operating within its ratings into the specified load, is pretty much indistinguishable from any other.  If I were a subjectivist, I'd probably be saying that the Crown sounds cleaner and less strained than the large class AB amp it replaced - but I don't subscribe to that viewpoint and doubt I could actually hear a difference.  The ear is a terrible measuring tool and is so easily influenced by the eyes.  But I do like to have measurements to confirm that the amp is actually working properly, and meeting its specs.  It's my engineering background digging my musician background in the ribs.   :-DD
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