Riaa curve

Hi Eldartford,

>>> Perhaps your spec of 1 dB is a misprint. <<<

Maybe ML printed some figure based on reality?

I am suspicious of measured claimed performance until someone else measures and verifies it.

Looking at J.A.'s (Audiophile) RIAA measurements of some highly regarded phono-stage makes me say that.
Most, or all of them do not do any better then that, and the GCPH? They didn't bother to measure it, so how accurate it the claimed 0.25dB ? --- And I mean at least across the full 20Hz to 20kHz.

Also, looking at the SMD technique used (ML), how on earth are you going to get much better than +/- 1dB, I wouldn't know right now.
(Pre-selected components to 0.1% from a component bonding automat??) That be something new to me...

Dear Eldartford: +++++ " You are correct that importance of RIAA frequency accuracy is over rated. The rest of the system, notably speakers, are much less accurate. " +++++

yes, even some cartridges specs are less accurate and this is one way to see that RIAA accuracy.

My overall/whole point of view is different and different not only on the RIAA accuracy but in each link on the audio system chain: almost all of us ( I hope ) want to be nearest to the recording and trying to achieve this goal we need ( between other things. ) accuracy, very low noise, very low distortions, etc, etc. trying to add the less and trying to lose the less all over the audio system chain, at least this is my goal ( of course the enjoying of the music. ) maybe yours is different.

Now, what is the inverse RIAA eq. curve? well it is the main factor why phono stages are a necessity where IMHO the main target in any phono stage must be to deliver an accurate inverted RIAA curve to mimic the one used on the recording to give us a flat frequency response with the gain/low noise/low distortions that our cartridges are asking for.

I don't care what happen after or even before the phono stage link the subject is that in that phono stage things must be working/processed with accuracy in the right way.

If I was thinking like you that there are other audio links with a higher un-accuracies then that spec could be +,- 3-5 db and no body cares anymore about.

But things are not so easy, the RIAA is a curve not a flat line so any single deviation in that curve ( at any frequency ) affects not only that deviation on that discrete frequency but affect almost three octaves!!

Do you think that you can hear a 1db deviation on the RIAA curve at 3Khz?, certainly yes because that deviation affects a wide frequency range and puts a continuous coloration in the sound reproduction ( of course that are people that does not care about, well I care. ), Eldartford I don't know how good are your ears perception but I can tell you that you can ( if your system has the resolution. ) hear even deviations as low as 0.1-0.2db

If that 3Khz deviation was the only frequency that was affected then you maybe can't hear it or detectec it.

Everything the same IMHO the RIAA accuracy makes a wide difference in the quality performance on almost any audio system.

Regards and enjoy the music,
Raul.

Hi,
I'm sure there is more then one way to measure RIAA error to start with.
If so, we are arguing about the emperor beard.

For instance to get to a fat response you need to have an inverse RIAA network, yes?

Now that in itself needs to be MORE accurate than the one you try to establish in the phono-pre.

Due to component tolerances there will be no two stages the same exactly, even if you go through 100reds of components.

All of this just plain and simply just begs the question of the manufacturability of such high tolerances --- if ALL surrounding it is WAY-OF in comparison.

Seems to me, like insisting your tyre pressure to be 0.01% correct... and it will make actually no difference if it is correct to 1%.
I can claim 0.01% but how to measure/confirm that it's like this in the first place, and then the temperature might just have changed, what now?

Sorry about the typo's, (need an editor sooner or later :-)

emperor = emperor's; fat = flat; just begs = begs; WAY-OF = WAY-OFF

Dear Axel: IMHO your tyre example tell me that you don't understand anything what is on my post or you don't really care about and it is nothing wrong with that because you like a person are a unique person as everyone else.

Btw, in our unit we make the RIAA calibration with the unit " hot "/warm to avoide changes due to temperature. Of ourse that in any audio item design we have to work between the parts tolerances, in some way this part tolerances are the limits to.

Regards and enjoy the music,
Raul.