For creating the new higher-resolution RIAA curves, I compared two curves: One with 100 points per octave (reference), and another curve (candidate) with many fewer points per octave. Then I went through the reference curve and checked the interpolation at each point in the candidate curve and noted the error to the reference. The plot below shows the result:
The plot above shows that 10 points per octave for the RIAA weighting will net an error no larger than 0.004 dB. 15 points will improve that to 0.002, and 20 points will improve that to 0.001.
The next release will have these higher resolution RIAA record and playback curve at 15 points per octave, from 1 Hz to 100k.
Is anyone using the IEC curves???
RIAA HiRes EQ.zip (3.9 KB)