Dynamic Wow and Flutter

[mtrycrafts]

...
3. Not all engineers are mentally rooted here on earth

That is absolutely true.

 

[mtrycrafts]

No, with my attitude I'm just less likely to be taken-in by silly claims that can't be explained by physics or engineering.

And perhaps some human psychology.

 

[mtrycrafts]

...

Don't get enthused, Haraldo, by this comparison to Einstein. Amplifier design and behavior is not like cosmology. Not even a little.

All we need is the car analogy being replaced by this

 

[mtrycrafts]

I'll start by trying to explain what I understand the test to have been. They were putting a pure tone sine wave and alternately square wave though an audio amp. They were then trying to induce the amplifier to cause a frequency shift in the output [FM modulation of the output] by varying the amplitude of the puretone [AM modulation of the input].

Where all of this falls apart is......well every single aspect. If you cannot measure a factor that you claim to be an audible distortion than how can you claim a correlation between a subjective experience and this "fm modulation" let alone causality. You might as well be saying "Fairy farts cause very unplesent audible distorting. We cannot tell when the fairys are farting, but you'll know they are when you hear the distortion."

Furthermore even if someone does prove that this FM distortion can be induced does not mean in the least that it would occur under normal operation conditions. Even if you can show that it will happen in program material you still need to determine how it effects the subjective experience.

I cannot possibly understand how people disagreeing with the upmost importance of curbing this FM distortion can be stated as a mindset that would halt advancement of audio equipment. Problem solving based upon actual data gets you much further than ghost hunting.

Finally, and for me one of the biggest red flags here. If the vast majority of leading people in a field "cannot understand" the "complexities" of something IN THEIR FIELD, that is usually not a good thing. It normally means that there is something dreadfully wrong with whatever they are reading that makes it more "incomprehensible" rather than "complicated".


But it is nice to know that we now have an explanation for phoenix effect distortion, as I'm pretty sure this is related.

No wonder those "leading amp designers" cannot get their head around this for the past 30 years.

 

[Send Margaritas]

Perhaps it explains some of the reason why you never hear the full scale of a symphonic orchestra at home, with your own equipment....
There's always a blurring and never full scale dynamics as in a concert hall

Isn't this simpler? Perfectly replicating an orchestra? Most home equipment doesn't include individual speakers for 80-100 musicians/instruments (AcuDefTechGuy is the exception ) with 80-100 tracks, with a setup replicating the direction of the sounds, acoustics of the room, etc.

And who said Fairy Farts are unpleasant? I smile every time I hear one!

 

[JerryLove]

It's not just the number of emitters. A violin (for example) radiates different sounds in different directions. These sounds all bounce off objects in your room and back to you.

I speaker that pushed the sound of the front of the violin towards the back wall would sound wrong. A speaker that pushed the sound of the back of the violin towards the font wall would sound wrong.

Then there's size issues. Much like a violin string resonates a violin, piano strings resonate a piano (and each other); so the sound emits from a very large space (how big was your speaker? Piano sized?) An Oboe on the other hand.

The list goes on and on. You cannot physically simulate this. Your best hope would be earphones (so no room interactions at all). You have to approximate it.

 

[Send Margaritas]

Very good points Jerry, as were those points made in your previous posts. I plead Nolo contendere!

There were a lot of well considered, logical, and measured responses to this question by the community. I'm unsure if the OP will appreciate this, but most readers will.

 

[JerryLove]

Did I say that already? I'm a bit scatter-brained