plugin for RIAA eq?

[Josh Lawrence]

Hi all,

I'm looking to record some albums into Ardour.  I have a hardware
phono preamp that does the secret-squirrel RIAA eq stuff, but it's
very flaky.  Is there a simple insert-it-and-forget-it eq for record
players?

--
Josh Lawrence
http://www.hardbop200.com
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[Fons Adriaensen-2]

On Mon, Nov 02, 2009 at 02:58:16PM -0600, Josh Lawrence wrote:

> I'm looking to record some albums into Ardour.  I have a hardware
> phono preamp that does the secret-squirrel RIAA eq stuff, but it's
> very flaky.  Is there a simple insert-it-and-forget-it eq for record
> players?

The only real solution is a hardware preamp. You can apply
the RIAA filter in software, but unless you start with a
*very* clean digital signal it's not a good idea to do so.

Neither a mic input, a line input or a high-Z instrument input
has the right combination of impedance and sensitivity for a
phono cartridge. Not using the right impedance will mean the
EQ will be wrong.

I do have an RIAA ladpsa plugin, let me known if you want it.
*If* you want to try without a real phono preamp the only
input type that *could* work is a high-Z instrument input,
with a 47k resistor in parallel. But the noise level could
be below par.

Ciao,

--
FA

Io lo dico sempre: l'Italia è troppo stretta e lunga.

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[Jörn Nettingsmeier-6]

Josh Lawrence wrote:
> Hi all,
>
> I'm looking to record some albums into Ardour.  I have a hardware
> phono preamp that does the secret-squirrel RIAA eq stuff, but it's
> very flaky.  Is there a simple insert-it-and-forget-it eq for record
> players?
>

i'm not aware of one. if you have an alternative preamp that matches the
impedance of a phono cartridge, try building the curve yourself:

check out the FIL plugin. it's a four-band parametric. nedko arnaudov
has written a nice graphical wrapper, google for lv2FIL.

then look up the curve (i think it's on wikipedia) and just reconstruct
it with the appropriate filter settings. here's another one:

http://www.euronet.nl/~mgw/background/riaa/uk_riaa_background_1.html

i could get something that roughly resembles the RIAA shape with just
two filters. it's not really correct, but it's a start.

hth,

jörn

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[Giorgio-10]

I've done that with good results with audacity (equalization -> riaa), i don't think there's a ladspa plugin on Ardour.

Hope this could help

G

2009/11/2 Jörn Nettingsmeier <nettings@...>

Josh Lawrence wrote:
> Hi all,
>
> I'm looking to record some albums into Ardour.  I have a hardware
> phono preamp that does the secret-squirrel RIAA eq stuff, but it's
> very flaky.  Is there a simple insert-it-and-forget-it eq for record
> players?
>

i'm not aware of one. if you have an alternative preamp that matches the
impedance of a phono cartridge, try building the curve yourself:

check out the FIL plugin. it's a four-band parametric. nedko arnaudov
has written a nice graphical wrapper, google for lv2FIL.

then look up the curve (i think it's on wikipedia) and just reconstruct
it with the appropriate filter settings. here's another one:

http://www.euronet.nl/~mgw/background/riaa/uk_riaa_background_1.html

i could get something that roughly resembles the RIAA shape with just
two filters. it's not really correct, but it's a start.

hth,

jörn

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[Arnold Krille-3]

On Monday 02 November 2009 21:58:16 Josh Lawrence wrote:
> I'm looking to record some albums into Ardour.  I have a hardware
> phono preamp that does the secret-squirrel RIAA eq stuff, but it's
> very flaky.  Is there a simple insert-it-and-forget-it eq for record
> players?

I think there is/was a preset for jamin for this floating on the web or even
inside the jamin distribution-package...

Oh, I like the old GDR record-players which had the correcting pre-amp built-
in. Just connect them to any line connector and you are set.

Have fun,

Arnold


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[Chris Edwards-2]

fons@... wrote:

> On Mon, Nov 02, 2009 at 02:58:16PM -0600, Josh Lawrence wrote:
>
>  
>> I'm looking to record some albums into Ardour.  I have a hardware
>> phono preamp that does the secret-squirrel RIAA eq stuff, but it's
>> very flaky.  Is there a simple insert-it-and-forget-it eq for record
>> players?
>>    
>
> The only real solution is a hardware preamp. You can apply
> the RIAA filter in software, but unless you start with a
> *very* clean digital signal it's not a good idea to do so.
>  

Josh, if you decide to go the hardware route as Fons suggests, and
you're not afraid of a soldering iron, ESP Sound have what by all
accounts is an excellent phono preamp for moving-magnet pickups.

Circuit description:
http://sound.westhost.com/project06.htm

PCB purchases:
http://www.sound.westhost.com/purchase.htm
--
Chris
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