I wanted to drop back in with some test results based on a different nulling approach. It appears to have been awhile since anyone discussed this here. (The test required recording both the flat, RAW, signal and the analog EQ'd signal simultaneously.)Īs expected Cool Edit's FIR filter's weren't even close. Olaf's vst plugin also offers Inverse RIAA.īased on null testing the vst and Nyquist tools are essentially mathematically equal with a 60 dB correlated null depth.Īnalog to DSP comparison is surprisingly close (about 20 dB correlated null depth in some tests) with the bulk of the difference in the top octave, IMHO, due to the converters used. With the Nyquist scripts you can modify gain, sample rate and add a 50 kHz zero. There are links to an Audio Diffmaker difference file, links to Olaf Matthes' vst plugin and some ready-to-use custom Nyquist scripts based on Wayne Stegall's coefficient generator program. I was driven by the inaccurate phase response of Cool Edit's and Audacity's FIR RIAA filters to find something better and wanted to prove to myself that IIR was equivalent to analog. The analog EQ I used for comparison is this one:
I wanted to share with you guys some work I've been doing comparing RIAA IIR Biquad plugins to analog RIAA EQ.Īfter finding an accurate-sounding IIR vst plugin for Audacity (and a Nyquist RIAA coefficient tool) I was able to compare DSP IIR solutions directly to analog RIAA EQ using Audio Diffmaker.
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