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RIAA EQ Plug-in?

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RIAA EQ Plug-in?

Postby pa28 » Wed Oct 28, 2020 12:10 pm

Is there an RIAA EQ plug (for Cubase ) as I would like to transfer some vinyl without using my Notepad mixer which has the "Turntable" input, and instead record direct to Cubase 8.5 Pro.

Or are there actual EQ's that can be applied to get same result?
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Re: RIAA EQ Plug-in?

Postby CS70 » Wed Oct 28, 2020 12:31 pm

There surely are - a quick googling will yield quite a few.

I guess it could be possible to implement it with a regular digital EQ if it affords an arbitrary number of equalization points, or by using overlapping several instances of linear phase EQs, with the data in the link below. Sounds tedious, however :)

https://www.bonavolta.ch/hobby/en/audio/riaa.htm
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Re: RIAA EQ Plug-in?

Postby Hugh Robjohns » Wed Oct 28, 2020 12:45 pm

Yes, there are quite a few around, some paid for and some free. A Google search will reveal them, but here's a free one.

https://www.kvraudio.com/product/riaa-by-vacuumsound

...or you can approximate the curve using standard EQ and, again, you'll find the EQ specs online -- but it's roughly a +20dB boost below 500Hz and a -20dB cut above 2.1kHz... plus a high-pass roll-off below 20Hz, and a low-pass below 24kHz.

Just be aware that doing it with digital EQ won't optimise the signal-noise ratio across all frequencies in the way a well-designed analogue RIAA preamp will.
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Re: RIAA EQ Plug-in?

Postby James Perrett » Wed Oct 28, 2020 12:55 pm

You also need to be aware that your pick up cartridge expects to see a particular load and the frequency response will be wrong if it doesn't see the right load. The input impedance of a typical microphone input is much too low for a standard magnetic cartridge.
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Re: RIAA EQ Plug-in?

Postby Hugh Robjohns » Wed Oct 28, 2020 1:52 pm

Very good point... :ugeek:
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Re: RIAA EQ Plug-in?

Postby pa28 » Wed Oct 28, 2020 3:02 pm

All good stuff thank you, the bit about the cartridge/pre-amp may mean a rethink.
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Re: RIAA EQ Plug-in?

Postby Martin Walker » Wed Oct 28, 2020 3:18 pm

If I remember correctly, the recommended input impedance for a phono preamp is normally around 50k (most designs will simply use a 47k resistor, so that's often the value quoted).


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Re: RIAA EQ Plug-in?

Postby James Perrett » Wed Oct 28, 2020 4:41 pm

You remembered correctly Martin. Most need to see an input impedance of 47k ohms with a total capacitance of around 400pF. Since the cabling could easily have a capacitance of 200pF, the normal practice is to have around 200pF input capacitance in the preamp. Some designs have switchable input capacitance.

Some older Grado cartridges recommend an impedance of 33k ohms but these are pretty rare now.

A low output moving coil cartridge might be more suited to microphone inputs.
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