In the end if I have an amplifier that is .1dB down at 20kHz (pretty common) and say it has 1% distortion at 20kHz we will need a dialog to sort it out.
linear distortions are not measuered in percent as far I know
regards
aah there is an english wiki on it:
http://en.wikipedia.org/wiki/Distortion
regards
aah there is an english wiki on it:
http://en.wikipedia.org/wiki/Distortion
think of speakers and their massive waveform deformation or antialiasing filters in CDPs for example?
long wire runs in analog telephony and the impacts of group delay?
regards
Scott, you haven't addressed my ORIGINAL question. Do you hold to 0.1uF as the optimum single bypass capacitor for your AD797?
Secondly, I attempt to design the RIAA as accurately as I can. I use 1% caps and then segregate them into groups, by actual measurement, if I have enough, and use 0.5% Holco resistors with them. I calibrate it with the Jung-Lipshitz inverse RIAA network, once offered by 'The Audio Amateur'. I am normally within 0.1dB and I am very proud of it.
I do not know who this hi end dealer is, but this person has nothing to do with me and knows nothing about my design. I resent your assertion that I would DELIBERATELY modify my designs away from the ideal frequency response.
Secondly, I attempt to design the RIAA as accurately as I can. I use 1% caps and then segregate them into groups, by actual measurement, if I have enough, and use 0.5% Holco resistors with them. I calibrate it with the Jung-Lipshitz inverse RIAA network, once offered by 'The Audio Amateur'. I am normally within 0.1dB and I am very proud of it.
I do not know who this hi end dealer is, but this person has nothing to do with me and knows nothing about my design. I resent your assertion that I would DELIBERATELY modify my designs away from the ideal frequency response.
syn08 said:
It isn't that important. It's just a definition. Some people got together and said: if the amp has a non-flat freq response, let's call that linear distortion. All agreed, and that was that. As long as we all understand that, what's the problem?
Jan Didden.
andy_c said:
I think a PIC and a couple of digital pots at the right place could make this fully automatic. Wish I had more time
Jan Didden
john curl said:
It depends, we have discussed it and have reached no conclusion. If we put 1000uF||1uF||.1uF on the data sheet what do you think the customers would say?
I was only repeating what someone said to me, I thought you already explained that you had a mistake in a very early Levinson preamp that was corrected.
hermanv said:
No, and they do not care. What is worse, they are not aware of importance of such approach.
Scott, that was 35 years ago, BEFORE we had an accurate measurement equalizer for RIAA. That was copied from Dick Burwen's RIAA network for the LMP-2 phono stage, which I presumed was accurate, because Dick Burwen is usually very accurate. I found out later, to my dismay, that it was slightly inaccurate, and I fixed it with a Levinson JC-2 upgrade. It was a matter of engineering pride, NOT sonic improvement, for all intents and purposes.
Yeah, Id like to see more tone circuits on DIY stuff, but I guess some would argue it doesn't follow the "straight wire w/ gain" philosophy that I see is popular.
myhrrhleine said:
Inside a pre amp is the ideal place for them, and the emotion in the music just sails through that extra circuitry
fredex said:
Because today it would be too expensive (31 precision inductors with 31 precision metal film caps per one channel) to manufacture.
rdf said:
What is SAE?
I always was a fan of my own gear, but I have to admit that Altec engineers were ones of the best. To use that "tone controls" I just discarded opamps they used together with horrible transistor buffers modifying them to use less opamps of modern quality.
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