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 9th April 2003, 09:11 AM #1 stigla   diyAudio Member   Join Date: Nov 2001 Location: Trondheim Excact RIAA numbers? Hi! I was hoping someone could shead som light over the RIAA response curve. The points are as usual the 50Hz, 500Hz, 2120Hz and maybe the 50kHz. My question is: My guessings are: 20Hz = +20dB 50Hz = +17dB (20-3dB) 500Hz = +3dB 1kHz = 0dB 2120 = -3dB 20kHz = -20dB 50kHz = -25dB (??) but Im not sure. At least not about that 50kHz... I recently found this Excel RIAA table, showing numbers that obiously where calculated from one heck of a formula, and the numbers from that table compared to my points up there where not identical. So, what are the REAL numbers to use? Are this Excel Table accurate? I think so, but I would appreciate some comments, especially on that 50kHz point. http://www.bonavolta.ch/hobby/en/audio/riaa.htm Cheers;
 9th April 2003, 10:09 AM #2 peranders   Electrons are yellow and more is better! diyAudio Member     Join Date: Apr 2002 Location: Göteborg, Sweden I have an Excel file for three different kinds of RIAA filters. Send me a message if you want it. The time constants are: 7950 µs, 20 Hz (not common) 3180 µs, 50 Hz 318 µs, 500 Hz 75 µs, 2122 Hz __________________ /Per-Anders (my first name) or P-A as my friends call me PA03 LM4780 amplifier group buy, SIGN UP HERE for the group buy 0 boards left. 118 paid.
Brett
diyAudio Member

Join Date: Jan 2002
Quote:
 Originally posted by peranders The time constants are: 7950 µs, 20 Hz (not common) 3180 µs, 50 Hz 318 µs, 500 Hz 75 µs, 2122 Hz
Allen Wright (amongst others) also incorporates a 3.18us constant to compensate for the response of most cutter heads.

 9th April 2003, 10:53 AM #4 peranders   Electrons are yellow and more is better! diyAudio Member     Join Date: Apr 2002 Location: Göteborg, Sweden The last time constant is not official but some poeple think it's important. I think it's not very important but if you use a non-inverting amp you can get this almost for free. __________________ /Per-Anders (my first name) or P-A as my friends call me PA03 LM4780 amplifier group buy, SIGN UP HERE for the group buy 0 boards left. 118 paid.
fdegrove
diyAudio Senior Member

Join Date: Aug 2002
Location: Belgium
OF IMPORTANCE.

Hi,

Quote:
 The last time constant is not official but some poeple think it's important.
Well, I happen to care a lot about that particular part.

Quote:
 important but if you use a non-inverting amp you can get this almost for free.
Uh? How does that one go?
What's signal polarity got to do with this?

Cheers,
__________________
Frank

 10th April 2003, 12:24 AM #6 Jocko Homo   Banned   Join Date: Feb 2002 Location: As far from the NOSsers as possible After the rock throwing contest ends...... Somewhere I have the RIAA document, from the Beast itself, with the exact numbers. Maybe I'll look for it. Meanwhile.......this might be fun. [joke] Looks like Frank is becoming a Texan. Amazing the influence I have on people who actually pay attention. Jocko
mlloyd1
diyAudio Member

Join Date: Feb 2001
Location: Northern Iliinois
Re: After the rock throwing contest ends......

It's quite scary actually ...

mlloyd1

Quote:
 Originally posted by Jocko Homo ... Amazing the influence I have on people who actually pay attention.

fdegrove
diyAudio Senior Member

Join Date: Aug 2002
Location: Belgium
Texas Here I Come.

Hi,

Mon petit pois chiche?

Quote:
 Amazing the influence I have on people who actually pay attention.
Just hope it's a two way street so one day I can show you what tubes and vynil can do to cure you of digititis?

How on earth did you guys catch this booby trap anyway?

So the travelling plan is California, Texas, must check some New York ears too ( for onions) and than...Canada???

Cheers guys,
__________________
Frank

Jocko Homo
Banned

Join Date: Feb 2002
Location: As far from the NOSsers as possible
Here's the equation......

I'm sure that Phred will be more than happy to 'splain it you if need be. [joke]

Jocko
Attached Files
 riaaeqn.zip (56.1 KB, 73 views)

peranders
Electrons are yellow and more is better!
diyAudio Member

Join Date: Apr 2002
Location: Göteborg, Sweden
I have three different kinds of RIAA networks. This file did I make for my QSXM3 phono amp. The file is for my personal use, therefore not so pedagogical maybe.
Attached Files
 riaa_curve_optimal_noninv.x.zip (22.2 KB, 56 views)
__________________
/Per-Anders (my first name) or P-A as my friends call me

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