Relationship between sound envelope, and Measures on Amps (Part-1)

[ChocoHolic]

Let's see if your future measurement methods will bring some evidence.
Up to now I am slightly frustrated by the lack of coherence between your statements and measurements.

[AP2]

Originally Posted by ChocoHolic

Let's see if your future measurement methods will bring some evidence.
Up to now I am slightly frustrated by the lack of coherence between your statements and measurements.

Hi,
Apart from that my time is unfortunately fragmented.
I already posted the difference between input signal and output amplifier.
certainly agree that it takes other measures. especially the last to draw conclusions.
You agree that there is the possibility that many amps in the market have good audio measurements standards and the result is bad when you listen to? or all are good?
Although there is no doubt that something determines the realism of the sound, the first is the psu. it is not easy to prove. it is obvious that new measurement parameters are being born. or send you an amp and you listen and find ways to make the article, can be a good idea.
all that I could keep it to myself, instead of informing the other.
... yes, many do not love me, but many are correcting their amps and are thinking about how to implement the new psu.
Regarding the increased SPL (and more heat on the coil),
the study in collaboration with the CNR and the University of California is ready(related on concept only). doc and a lot of pic. and obviously you need a format (create article) to put on the thread. This takes a long time that I did not.
My time is made up of 30 min 1 hour segmented.
Patience...or collaboration. not have other way on this.

P.S.
this research on the coherence of the slew rate, has brought to light other things. e.g. DAC with resamples produces many errors independent of the frequency of resampling. The reason is, do not use the sync with the source. then, other interpolation false. This also confirms that a CD can have a good sound (when direct).

Regards

[elevator]

Originally Posted by AP2

Hi,
Patience...or collaboration. not have other way on this.

AP2, remember my offer for collaboration. May I suggest that you first write your article in Italian, taking all the time you need to make it coherent eg with hypothesis, thesis and all the proofs as you want, then I can translate it into English, and send it back to you.
Cheers,
E

[AP2]

Originally Posted by elevator

AP2, remember my offer for collaboration. May I suggest that you first write your article in Italian, taking all the time you need to make it coherent eg with hypothesis, thesis and all the proofs as you want, then I can translate it into English, and send it back to you.
Cheers,
E

Yes I remember and thank you for help.
well, this weekend send you some doc via email.
First, just for ultimate this thread (part-1). " effect of coherence time error"

Regards

[AP2]

For now I put this pic, which plays a simple snare (with springs). the signal is displayed in the sustain phase.
waiting for the comparative measurements between fast and slow amplifier (13uS) who prove conclusively the error.
reflection:
the vibrations of the springs are modulated in the "unbalanced" offset area. Therefore, the amp continues to modulate the power without going through the crossing point (reset time).

An example (just simple one) that helps to understand:
Many AB amplifiers have a classic 100-220nF capacitors between the up side and low side in the area of ​​the bias control. (ripple rejection)
is simple to adjust this capacitor in the report of thd, or (thd Vs. frequency). (helps lower)
seems to work just because we measure periodic signals with a perfectly balanced sinosuidal, (the amp regularly passes by the cross point). But I bet few people know that this capacitor, creates a lot of hysteresis, when the amplifier, modulate the current (need very fast), while it remains in the unbalanced area. (then,modify angle of peak)
This is why you need a new measure to determine the result of an amplifier, proposing the "condition" of real work.
A very fast ,professional AB, not adjust measure with this capacitors.