Not really.
Just because there is a norm, it is not sure the norm is used everywhere.
In fact, there are many records with non standard EQ.
FM delivered a paper with many sheets, which EQ has been used by which company.
Stereo records started sales in 1958.
Today we have some remastered records and don't know what happened while remastering. Furthermore todays cutting machines are the old ones, nobody knows if they are still good in shape, its hard to get good acetat discs and the process to metalize them and so seems to be not so easy due some lack of wisdom and material . We also never know which kind of Mastertape has been used.
And BTW, Cutting heads amplifier used Feedback to control the Resonance of the head. So how did those amps sound, which were used?
I know there is a lot of rubbish spouted about alternative curves and when they were used, often by the people selling phono stages with adjustments! And of course the internet copies it until 'it must be true' 🙂 Hopefully a definitive list will come. Most agree that from 1955 nearly all recordings adhered to RIAA. http://www.arsc-audio.org/journals/v20/v20n1p14-23.pdf gives a good list. My monos are post 1955 so I think I am ok. If I start collecting earlier Mono microgrooves i will think again 🙂
I think you are confusing the equalisation curve for the cutting with general EQ. There are always things you might want to adjust in the FR to get around some limitation in process, but changing the RIAA network may not be the best way. But that is a whole other topic for discussion!
Since there are no 24 bit DAC's or ADC's you are measuring their particular performance, you are NOT making any measurement that tests the mathematical underpinnings of dither. I cease to understand the point dither is based on first principles and it has been used even in mechanical systems to prevent cogging for decades, considering your background I am surprised.
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yes - don't try this with past R-2R, but some delta-sigma audio DAC can show differential linearity of the last few bits well below their own internal noise
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You mean something like this:
http://linearaudionet.solide-ict.nl/sites/linearaudio.net/files/recording emphasisv10.pdf
Jan
sort of....
Taking my DG example, its 1955 and mono. Your table suggests that all mono DG uses 1590 which ISTR makes it about 3dB out at 10KHz on RIAA.
Taking my DG example, its 1955 and mono. Your table suggests that all mono DG uses 1590 which ISTR makes it about 3dB out at 10KHz on RIAA.
Don't know Scott, that's all I got.
And this:
http://linearaudionet.solide-ict.nl/sites/linearaudio.net/files/galocollpcurvefinal.pdf
Jan
And this:
http://linearaudionet.solide-ict.nl/sites/linearaudio.net/files/galocollpcurvefinal.pdf
Jan
The Manual of FM 222 has also no information abouth this and Jan's list is more complete. Thanks Jan.
FM Manual mentionend that RIAA was established not before 1958, that some records were made with wrong Pre-emphasis thereafter since the cutting machines were not so good above 10 Khz until 1968 , thus some manipulations in the frequency response before pressing and that some records in the 70's and 80's had excessive HF (Brightness) and need some attuenation.
Of course, I have to provide for MM type cartridges in most of my later preamps. I wound not go out of my way to use that 'feature' however. I'll stick with MC, as I have done enthusiastically for the last 50 years.
This is the part that I think has become lore due to repetition. I am amazed given how a**l some record collectors are that the real truth has not been made available. There must be information out there in archives?
yes.and that is even better ! [Not topology of VFB with global NFB to reduce distortion.] Got the dual regulated bench supplies to power it... just came in. Next are some big heat sinks. And, then the fun will begin.
Thx-RNMarsh
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I have two players with different CD drives..... one player with common consumer drive and the other uses a computer drive to play CD's. Which is better and why?
THx-RNMarsh
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