I have spent my last 5 years trying to cure for the jitter, building, measuring and listening days by days.
But it looks like the jitter does not matter since I got tons of insults from several guys who are writing on this thread.
"Two ears and a brain are massively more analytical and adaptable than an omnidirectional microphone and an analyzer"
This is true, for example, an omnidirectional microphone and analyzer will pick up what looks like dramatic comb filtering when to two ears and adaptable brain it is hardly noticeable if at all.
This is true, for example, an omnidirectional microphone and analyzer will pick up what looks like dramatic comb filtering when to two ears and adaptable brain it is hardly noticeable if at all.
The output impedance of the tube amp, combined with speaker impedance wiggles, could emphasize certain frequencies.
It would be an interesting experiment to measure the frequency response of the tube amp with 8R resistive load and with speakers. Could also record the output of the tube amp with a soundcard while it is playing in a 8R resistive load, then playing with real speakers connected, then ABX the files. Or compare the tube amp with the LM3886 amp having a resistor in series with the output, of equal value to the output impedance of the tube amp.
Also:
Are you specifically hunting high order distortion from the output stage (which is pretty much the only place that can make high order harmonics in a properly working class AB amp)...
Of course, but for what purpose?
The verdict was clear: noone did pick the LM3886 amp.
All did prefer the 845 amp since they found its sound much more similar to the live event.
I don't think one should change his choice because the measurements tell a different story.
Listening to music should be a pleasure not a torture.
The verdict was clear: noone did pick the LM3886 amp.
All did prefer the 845 amp since they found its sound much more similar to the live event.
I don't think one should change his choice because the measurements tell a different story.
Listening to music should be a pleasure not a torture.
I have no explanation, I wasn't there, neither at the original event or the reproduction of it, this is where it could have been interesting to measure both as it's possible one amp was adding something that was similar to something that was present in the original space but that the recording didn't pick up sufficiently.
He already tried and failed.
Not to those in commercial venue. For them it's a marketing material and they take it seriously.
Between the two amplifiers the one that can get affected the most from the load is surely the 845 SE because of its limited power and especially current capability.
So further measurements can only demontrate previous measurements.
<insult
>Then why are you promoting the phase noise measurements for the oscillator(s) you are peddling on this forum?
</insult
>
"I conclude, we've been invaded by beings from another world.
And they want to call ME nuts?"
Given that the number of people who use this forum is miniscule and of them the number that think that way is tiny, I conclude you are nuts to come to that conclusion.
Listen, I rarely even post anything on a thread that's been blabbering on for an eternity, because those threads have already shot their load and become boring as all hell.
But sometimes I just like to toss my 2 cents in and see reactions... like yours.
I wouldn't even think of using an AP for this. The industry has moved far on this for instance Kilppel. If you are not familiar with what is going on now maybe you need to do some research.
I cannot explain why all the participants did choice the 845 amp, but I can explain because they didn't choose the LM3886 amp.
There is no correlation between the measurements and what we are perceiving (or what we prefer if you like).
Hi Andrea,
Okay, one huge issue you are having is a very poor grasp of scientific principles where it comes to designing an experiment. The sound of each amp is predicable, but your tastes and how you perceive the sound is entirely your own taste. Besides, you have to look at the spectrum and noise floor. As Dave mentioned, single number distortion figures are completely useless. Like a single word without a sentence to define the meaning. What else would you expect.
Your example was entirely predictable. I was waiting for you to present it. Too many variables and a question of personal taste. It wasn't even worth posting or thinking about from your end.
Hi peufeu,
No magic involved (sorry), just experience and observation coupled with theory.
Okay, one huge issue you are having is a very poor grasp of scientific principles where it comes to designing an experiment. The sound of each amp is predicable, but your tastes and how you perceive the sound is entirely your own taste. Besides, you have to look at the spectrum and noise floor. As Dave mentioned, single number distortion figures are completely useless. Like a single word without a sentence to define the meaning. What else would you expect.
Your example was entirely predictable. I was waiting for you to present it. Too many variables and a question of personal taste. It wasn't even worth posting or thinking about from your end.
Hi peufeu,
That's one aspect of course. Both the order and amplitude tell a story, as does the clutter near the "grass". But also important are the IMD results. In gross cases you might have to look at frequency response, but most amps today are pretty flat. If they aren't, that normally points to some serious design issues.
No magic involved (sorry), just experience and observation coupled with theory.
While I'm doing the research I'm still waiting for someone who explain the relationship between the measurements and what we hear.
Did you actually measure the SPL at the listeners position. You would probably see plenty of differences that qualify as easily audible.
- Status
- Not open for further replies.