I haven't played with class D in a while, are we at PASS level yet? - Page 26 - diyAudio
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Class D Switching Power Amplifiers and Power D/A conversion

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Old 19th March 2012, 03:41 AM   #251
JZatopa is offline JZatopa  United States
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I'm curious, has there been a class D design that is modeled after the Blameless amplifier. By that I mean the design was made to perform as good as you could possibly get before you add in feedback? I am not sure if this thought process works on class D design but I am not sure why it wouldn't.
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Old 19th March 2012, 10:27 PM   #252
Pafi is offline Pafi  Hungary
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Eva made power stage essentially distortion-free. (No dead time.) The other open-loop distortion-source is power supply. Stabilised, synchro-rectified PSU.
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Old 20th March 2012, 03:37 PM   #253
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ok, i just read all 26 pages.
i have no answer for the op, but ive learned allot.
i have listened to class D amps ....Bel canto i think (little gray box mono blocks 500W if i remember right.) on joseph audio speakers and psb. i remember i thought i didnt like either speakers at all untill the guy demoing them said i bet i know why, he changed to a nad intergrated low watt and i found the music much more pleasing.
why? i dont know. but i am going to build some class D monos now to see what im learning here. now im curious.
ill be compairing them to anthem amps and diy alephs, on paradigm spekers.
i wonder what ill hear and how that transfers to what i see on a scope?
please forgive spelling no check useing my phone.
I'm not crazy, my mother had me tested
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Old 4th April 2012, 05:48 AM   #254
JZatopa is offline JZatopa  United States
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Originally Posted by Eva View Post
Sound travels at approx 345 meters per second in air. When you are listening 2 meters away from the speakers what you hear is not the original signal, it's the original signal with 6 milliseconds of group delay across the audio band (plus other components). Filters (and amplifiers) behave almost in the same way across their pass band. Speakers are much worse because their group delay is not constant.

Is that distortion? Nerd thinking.

Signal does not propagate infinitely fast. Everything adds delay/phase shift.
True but as they say GIGO. The more accurate you can make every part of the system, the better the end result.

How about this for an idea. Instead of just measuring thd+N, we measure thd+n and IMD and phase distortion and temporal/transient distortion and make that a new measurement that takes into account every way a signal can be distorted. We can call it TSD or total signal distortion.
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