Audacity Forum

steve wrote:It would really help if you posted a short audio sample in WAV format so that we can see exactly what is going on. Images and numbers will often not tell the whole story. Please post that section 14 to 19 seconds from the "before" screenshot in your last post. in WAV format. (Instructions if you need them: http://forum.audacityteam.org/viewtopic ... 49&t=72887)

I hope it's alright that I give you another example.

Signal straight from my Scarlett 2i2

After the Audacity RIAA curve

After the 3rd party RIAA curve

You can just put the image between tags. Don't add URL tags as well.

Gale

The plugin README http://www.nullmedium.de/dev/audioplugins/ says "Signal levels with no gain are calculated to give 0dB gain at 1kHz."

The plugin (set to 0 dB gain) applied to 0.8 amplitude white noise seems to me to produce an identical spectrum shape to Audacity 's RIAA curve. The peak in the plugin's waveform after application is +3 dB which is slightly more than the +2.9 dB for the Audacity curve.

Applying the plugin (set to 0 dB gain) to "Before RIAA.wav" gives about 5.5 dB higher RMS and 5 dB higher peak than the Audacity curve. The shape of both resultant spectra looks identical.

When the result of either curve is maximised in Amplify, the audio looks similar but not identical.

I agree it is potentially suboptimal to record RIAA-equalized material "flat" into an interface. You might do it if you had pre-RIAA era discs, then applied inverse RIAA and finally the actual curve that the disc used.


Gale

OK

I'll try a dedicated phono preamp today and won't bother you any more.
Thanks.

Missed one. The other thing a "real" phono preamp does is provide a place to connect the auxiliary shield connection. In English, that's the thin black third wire coming out of the turntable. Note the Behringer unit has a screw terminal to connect that wire. When the RIAA system boosts the bass tones, hum and power interference are likely to come up as well. This third wire prevents that interference.

Koz