RIAA is a frequency pre-emphasis de-emphasis system. I don't quite want to invest time in trying to understand "raw LP tracked sound to compensate the helical tracking of the tangent cutters of the master lathe", but it projects strong images of an ape behind a typewriter.
It is what physicists call 'not even wrong'.
Does Robert really expect us to point out the error in each sentence? The purpose of RIAA, how feedback works etc. are well documented so the truth is available for anyone who wishes to discover it.
Does Robert really expect us to point out the error in each sentence? The purpose of RIAA, how feedback works etc. are well documented so the truth is available for anyone who wishes to discover it.
Reminds me of a joke: Every time I drink tequila everyone around me turns into an a-hole.
In case you don't get it, the EE's aren't the problem.
yes, even the base realities of RIAA Mastering Practice accuracy introduced phase and frequency uncertainty magnitudes blow away the properly enumerated objections re op amp, feedback implementations
RIAA curve accuracy is a easily pursued numbers game but in fact the cutting room engineer re-equalizes the master tape source on his own monitor system (different from the mastering monitor setup) to his own taste (hopefully with the goal of reproducing the master eq on the produced vinyl) there is no reason to expect even skilled recording engineers to approach 0.1 dB accuracy (~= 1%) in such a scenario
how about those different mastering studio response?
RIAA curve accuracy is a easily pursued numbers game but in fact the cutting room engineer re-equalizes the master tape source on his own monitor system (different from the mastering monitor setup) to his own taste (hopefully with the goal of reproducing the master eq on the produced vinyl) there is no reason to expect even skilled recording engineers to approach 0.1 dB accuracy (~= 1%) in such a scenario
how about those different mastering studio response?
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Tell me this: How does a voltage that appears at the opamp output get through the feedback loop to the inverting input with absolutely no time delay?
How large is that time delay versus the phase difference?
How much different is a buffer + LCR RIAA versus an active RIAA in terms of time delay?
You guys can't see the fundamental problem. Clear that fog of math, measurement and meters out of your heads.
Event at output can not get to input instantly! Put filters in the way and it takes even more time.
Event at output can not get to input instantly! Put filters in the way and it takes even more time.
How much time delay is there in your dear buffer?
P.S. We're talking ns to ps delay. Audio is essentially DC in relative terms. Nothing wacky/fundamental issue here.
P.S. We're talking ns to ps delay. Audio is essentially DC in relative terms. Nothing wacky/fundamental issue here.
It is amusing that the feedback cutting head is considered one of the more important advances in LP technology after the introduction of microgrooves.
morinix, I don't see any problem with your approach with an inductor and so forth. If we are talking about using some kind if iron or ferrite core inductor, it may in fact sound better to most people.
On the other hand, the explanation offered about op-amp feedback delay is not the most plausible one for why the passive, inductor network sounds better to many or most people, and especially so for critical listeners.
On the other hand, the explanation offered about op-amp feedback delay is not the most plausible one for why the passive, inductor network sounds better to many or most people, and especially so for critical listeners.
Truly a master troll. I find it a little surprising your products even function given your lack of understanding. You seem to view your ignorance as a badge of honor. Sad, really.
They have been documenting this for many decades. You're really just too inltellectually lazy to do your own legwork.
Jan
Passive RIAA = gain, equalization, gain. Or some derivative thereof, right? Okay, so not buffers, but you need gain stages, no? Acknowledging the differences in component and design, what audible differences due to prop delay are you getting passive equalization vs active?
http://www.analog.com/media/en/training-seminars/design-handbooks/Op-Amp-Applications/Section6.pdf Starting on pg. 18.
http://www.analog.com/media/en/training-seminars/design-handbooks/Op-Amp-Applications/Section6.pdf Starting on pg. 18.
In case you get the urge to think: how much time does the feedback signal take from the deviation of your bicycle from straight path, to your eyes, to your brain processing, generating a control signal, send it to your hands/arms to do the correction, and you never (almost never) fall down? Isn't feedback wonderful . 😀
Jan
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