• Registered: 2019-05-31
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Topic: .adieqpr EQ request for reverse RIAA curve

Hi everyone!
I am starting to get into 78s and of course the first problem i encounter is RIAA equalization. Would it be possible to know if one of you lot has a reverse RIAA curve PEQ preset I could use please? Thanks a lot! They are 1940s records. I'll get down to the business of finding the right EQ curve for each and every one of them later.

All the best

2 Reply by KaiS (edited by KaiS 2024-02-01 20:58:05)

  • KaiS
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Re: .adieqpr EQ request for reverse RIAA curve

An EQ preset to reverse ADI-2/4 Pro SE’s RIAA EQ – you’re lucky, by chance I just did one for measurement purpose smile


The inverse RIAA EQ preset needs to be loaded into Output 1/2 or 3/4, and Loopback post FX to 1/2 (or 3/4) needs to be active for recording ADI-2/4 Pro SE’s vinyl input WITHOUT RIAA EQ.

The preset will NOT work in the Analog Input, as it uses the Bass/Treble EQ bands that are not available there.


The inverse RIAA EQ preset linearizes ADI-2/4 Pro SE’s vinyl input for a frequency response 20 Hz – 20 kHz +/- 0.1 dB.

https://cdn.head-fi.org/a/12282460.jpeg?_gl=1*1855fhu*_ga*MzcxMDU1MDUzLjE2NDgxMDEwNDM.*_ga_2V1TD71NX3*MTcwNjc5ODIwNi4zNi4xLjE3MDY3OTkxOTMuMC4wLjA.



@MC:
For stuff like that I always miss a possibility to switch the cut- and shelf-filters to 6 dB / Octave.

A solution for the GUI would be:
Turning the Q-parameter lower than 0.5 it could just switch to “0” or “off”, as 6 dB / Oct. filters don’t have an adjustable Q-factor.

KaiS's Website

  • Registered: 2019-05-31
  • Posts: 34

Re: .adieqpr EQ request for reverse RIAA curve

Thanks a lot, what fantastic help! I forgot to mention I do not have the ADI-2/4 Pro, only the latest ADI-2 Pro.
However as you might have gathered I'll be using my phono pre before the Analog Input. At least I'll have a flat frequency response to start with before applying whatever unique EQ these records need.

Thanks again!

4 Reply by anthos314 (edited by anthos314 2024-10-10 14:52:32)

  • Registered: 2019-05-31
  • Posts: 34

Re: .adieqpr EQ request for reverse RIAA curve

Sorry to resurrect this old thread, but I have a question about the Adi 2/4 SE RIAA mode.
Is it possible to use the amplification but not the RIAA eq, in order to have a flat (but recordable) signal?

Thanks a lot!

5 Reply by MC

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Re: .adieqpr EQ request for reverse RIAA curve

Not possible.

Regards
Matthias Carstens
RME

MC's Website

6 Reply by KaiS (edited by KaiS 2024-10-10 16:36:31)

  • KaiS
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Re: .adieqpr EQ request for reverse RIAA curve

anthos314 wrote:

…Is it possible to use the amplification but not the RIAA eq, in order to have a flat (but recordable) signal?!

ADI-2/4 Pro SE ‘s vinyl amplification is in the digital domain anyway.

If, with RIAA Mode disabled, you max. ADI-2/4 Pro SE’s input level (input Ref Level +1 dBu), Trim Gain Left, Right to +6 dB, you get what you want, albeit with rel. low digital level.

Record a “raw” file at 24 or 32 bit, then apply digital gain and the desired de-emphasis EQ curve.


This approach does NOT work with ADI-2 Pro, as it’s input impedance is much too low for direct connection of vinyl MM-pickups.
You would end up with a very dull and noisy result.

A phono preamp without RIAA EQ would be needed, something not available off-the-shelf.

KaiS's Website