Creating an RIAA inverse curve for Audition

[Grant]

OK, I know i'm very close. Using the Parametric Equalizer in Audition, this is the preset I developed. Can anyone feeding a turntable directly into the soundcard try it and see how it sounds?

RIAA,3,1,20,16,20627.5,0.4,1,1,1,0,1,58. 3188,121.447,189.438,500,22050,2,2,2,2,2 ,5.6,4.9863,0,-0.383562,0,0

All you need to do is locate your AUDITION.ini file, copy and paste the string as the last item under the [Parametric Equalizer] column. Don't forget to list it as the next item number in sequence, following the example of the others. Then, open Audition, cerate a needle drop sample w/out the phono stage, normalize it to 100% or something, open the parametric EQ, and test it.

[proufo]

Hello Grant.

I have a link somewhere to the numbers.

Will look for them and report.

[Grant]

OK, here is a 320kbps mp3 sample taken directly from my Mobile Fidelity vinyl LP of George Benson's "Breezin'" using my curve.

http://download.yousendit.com/F3FDBBE30B8B1E5C

[proufo]

This is the link:

http://www.a-reny.com/restauration/avance.html

[Grant]

Here's the thing about my curve: I am plugging the TT directly into my E-mu RCA analog in, not any microphone jack. Second, I am curiously finding that I don't need to cut the treble in any way. All I need to do is boost the bass. I don't know why, but that's what I have to do to get things correct. I'm also using the 500Hz turnover as my staring point for bass boosting.

[Grant]

Anyone?

[rubbersounds]

I haven't got an audition.ini file.... ?

[OcdMan]

If you want to manually create an RIAA filter, here you go (http://www.tanker.se/lidstrom/riaa.htm). Just enter the values from the "RIAA" column into the filter of your choice. Piece of cake. :)

[OcdMan]

I haven't got an audition.ini file.... ?

It's not in the application's directory. It's buried in a subdirectory under "Documents and Settings".

[OcdMan]

Second, I am curiously finding that I don't need to cut the treble in any way. All I need to do is boost the bass. I don't know why, but that's what I have to do to get things correct.

I'm thinking you're not having to cut the treble because the input resistance on your sound card is probably much lower that 47,000 Ohms. So the highs are already being rolled off due to that. I guess even if you could get my RIAA preset to work (or the one linked to in proufo's post) you'd still have to do some tweaking to get a truly flat response.

[Metoo]

So, wouldn't it be easier if someone posted the preset?

[OcdMan]

So, wouldn't it be easier if someone posted the preset?

Every cartridge/soundcard combination is probably going to be quite different so the amount of treble tweaking is going to vary a lot. Using the actual RIAA curve is a good place to start, IMHO.

BTW, do you still need help with the INI file? Sorry I didn't get around to it earlier.

[Grant]

I haven't got an audition.ini file.... ? Yes, you do. You have to have "Show Hidden Files" checked in folder options ti see them in Win XP.

[Grant]

If you want to manually create an RIAA filter, here you go (http://www.tanker.se/lidstrom/riaa.htm). Just enter the values from the "RIAA" column into the filter of your choice. Piece of cake. :)
That chart is exactly the kind of thing i'm looking for!:righton:

[JLGB]

So no preamp for turntable? Kool!

[Grant]

The curve ocdman (Matt) provided was a slightly beefier version of the one I created. Actually, my approximation sounds a bit more like a Shure cart with a slight treble boost!:)

[ChristianL]

All you need to do is locate your AUDITION.ini file, copy and paste the string as the last item under the [Parametric Equalizer] column. Don't forget to list it as the next item number in sequence, following the example of the others.
Off topic, but now I kno how to transfer a self-made 20 point FFT-setting (de-emphasis) from my old PC to my new one without creating the curve from scratch.

[BradOlson]

Audition 2.0's audition.ini files are written differently than 1.5's files.

[vanmeterannie]

I'm thinking you're not having to cut the treble because the input resistance on your sound card is probably much lower that 47,000 Ohms. So the highs are already being rolled off due to that.

I completely agree - this is almost certainly the culprit.

[gloomrider]

I'm thinking you're not having to cut the treble because the input resistance on your sound card is probably much lower that 47,000 Ohms. So the highs are already being rolled off due to that. I guess even if you could get my RIAA preset to work (or the one linked to in proufo's post) you'd still have to do some tweaking to get a truly flat response.

This is fascinating! So the only way to really eliminate a phono-pre for needledrops is to ensure that the A/D input impedance is 47K Ohms?

Am I correct in assuming that the input impedance of a typical "line in" is around 10K Ohms? Would the same be true for A/D?

[rubbersounds]

Yes, you do. You have to have "Show Hidden Files" checked in folder options ti see them in Win XP.
I found it, thanks.

[Metoo]

Every cartridge/soundcard combination is probably going to be quite different so the amount of treble tweaking is going to vary a lot. Using the actual RIAA curve is a good place to start, IMHO.

BTW, do you still need help with the INI file? Sorry I didn't get around to it earlier.Wouldn't the actual RIAA be the essence of what is being sought here (certain sound card issues notwithstanding)?

BTW, I did find the AUDITION.INI file, but for some strange reason I see no Parametric Equalizer in it.

[Doug Sclar]

Wouldn't the actual RIAA be the essence of what is being sought here (certain sound card issues notwithstanding)?

BTW, I did find the AUDITION.INI file, but for some strange reason I see no Parametric Equalizer in it.

Sure,

But there is quite a bit of variance between cartridges. The last time I played with frequency response and cartridges I tried three V15xMR's. The frequency response of all three was slightly different and changed depending on VTF and other factors. I was not playing around with any RIAA curves, so all I did was to measure the responses.

Granted the differences weren't major, but they were surely noticeable sonically. I guess the best way to really dial this in would be get a test record and try to get flat response across the board with the available eq curves. Adhering to the RIAA curve isn't necessarily the goal in this case. A flat response incorporating the RIAA curve is.

[Metoo]

Sure,

But there is quite a bit of variance between cartridges. The last time I played with frequency response and cartridges I tried three V15xMR's. The frequency response of all three was slightly different and changed depending on VTF and other factors. I was not playing around with any RIAA curves, so all I did was to measure the responses.

Granted the differences weren't major, but they were surely noticeable sonically. I guess the best way to really dial this in would be get a test record and try to get flat response across the board with the available eq curves. Adhering to the RIAA curve isn't necessarily the goal in this case. A flat response incorporating the RIAA curve is.
You've got a good point here, and a great reason for tweakers to spend their next couple of weeks doing what they love best. :)

[vanmeterannie]

This is fascinating! So the only way to really eliminate a phono-pre for needledrops is to ensure that the A/D input impedance is 47K Ohms?



Essentially yes, the way I understand it and based on my own observations. Loading affects a several octave range that seems to be centered somwhere around 16-18k, so too little and you get a peak there and too much and it rolls downhill.

So software with the curves built in leads to people like my brother-in-law recording albums with the table plugged directly into the sound card and a lot of top rolloff when he applies the RIAA filter, but he won't listen to me when I try to talk him into using a preamp since that seems to be unnecessary to him.