Any feedbak loop has definite settling time, and even if this time very small, sound is a bit affected. Such NFB effects could be eliminated by using some low-pass RC filtering, some manufacturers do it, but than "lens" (amplifier) becomes non-transparent.
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Let me offer yet another possible source for grainy sound - eddy currents and/or lack of proper cable terminations. No experience of these issues but I do remember reading with a high level of curiosity about Dennis Morecroft.
DNM Design - Home page
empirically i must agree: musical enclosures outside paradign of most engineers
There is a wealth of information out there about the detrimental affects of rf ingress into your hi-fi where it is not wanted too.
DNM Design - Home page
empirically i must agree: musical enclosures outside paradign of most engineers
There is a wealth of information out there about the detrimental affects of rf ingress into your hi-fi where it is not wanted too.
The valve amps i enjoy have a dominant 3rd which does not stop them from being completely grain free. Lots of transistor amps are similar, so the second harmonic mantra is (again) not the answer.
And another favourite platitude, the wire with gain, has made a re-appearance. It dates to a long forgotten, innocent era when all wire sounded the same
I do not buy the idea that an amp with very low distortion and noise can have a grainy sound.
Again let's focus the recordings. Often they are compressed, wildly equed, distorted ... it is just normal that they sound grainy.
The amp just shows that.
Let's take a recording above all suspicion and listen ...
Again let's focus the recordings. Often they are compressed, wildly equed, distorted ... it is just normal that they sound grainy.
The amp just shows that.
Let's take a recording above all suspicion and listen ...
Lowest amp distortion does not guarantee lowest acoustic distortion. Not that simple.
If you consider the precise manner in which amp measurements are made you may note that its eminently possible. All an amp needs is susceptibility to ultrasonic ingress -either normal-mode or common-mode (as those wouldn't normally be tested for in standard measurements) and a source component that generates either or both of those.
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Just casual I think, preferably with one other person who agreesThe details of listening test method which you won't disclose.
A tiny phase shift won't be audible. The quality of the feedback network is important since it is in the signal path.
Yet no one has established any link between the known types of distortion and grainy sound. And especially not to harmonic distortion.
Your position is a mystery, unless it is just a paraphrase of the old "all amps sound the same"
Next step is to design by ear ?
seriously ... lab instruments have a market ... so i guess measurements are of some help in assessing the quality of an audio equipment
Maybe we do not know well what to measure ... but noise is noise ... distortion is distortion
If you send inside 1 kHz and you get at the output 1 kHz plus many harmonics that is not fidelity to the source signal
https://www.stereophile.com/images/619PLE400fig7.jpg
One thing i believe ... to perform tests with real loads (i.e. complex) and not a pure resistor ...
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That is correct. Why people argue high and low over distortion of the voltage output while being oblivious to the acoustic distortion that we directly hear is beyond me.
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You do realise this same revolutionary tactic has been discussed since before Castro ruled Cuba?
That is correct. Why people argue high and low over distortion of the voltage output while being oblivious to the acoustic distortion that we directly hear is beyond me.
you mean that they do not know how to measure the acoustic distortion ?
still i have the feeling that truth can hurt ... bad recordings will be very evident through transparent systems ... less so with veiling systems
Like makeup covering wrinkles
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still i see measurements usually performed with pure resistive loads
at least they could add some capacitance ...
How is it possible for people to find out if they don't even know that audible differences do exist? Who is going to set up the ABX test and who will going to pass the test? If you knew the mechanism what's in it for you to setup the test and be the Guinea pig?
No, I meant people simply ignore the most important parameter, the acoustic distortion. But they like to argue a lot on amplifier voltage output distortion without clear measured correlation to the acoustic side.
Most important to you?
I ask because amplifier vs speaker distortion has been discussed a lot in the past. Earl Geddes explained why he thought the higher distortion of speakers is typically less objectionable than distortion in the electronics.
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