After reading that in ProQ 3 I need to multiply every value by 1.41 (precisely sqrt(2)) to get a compatible setting, I got a bit confused and I've spend half the day comparing macOS EQ solutions.

I made a log sweep .wav file, 24/96/mono.

I took oratory1990's Sennheiser HD650 Optimum settings, and I applied:

- FabFilter ProQ, with 1.41 correction

- FabFilter ProQ, without correction

- EqualizerAPO (via benchmark.exe, 16-bit only)

- AUNBand from Apple (included free in macOS)

Then I compared them all using DeltaW.

Results:

AUNBand ~ EQApo: 77 dB / 71 dBA, gain error max -35 dB

ProQ corrected ~ EQApo: 80 dB / 73 dBA, gain error max -37 dB

ProQ corrected ~ AUNband: 85 dB / 94 dBA, gain error max -37 dB

---

ProQ non-corrected ~ EQApo: 19 dB / 19 dBA, gain error max -3.6 dB (!!)

I'm just starting on EQ-ing, but I guess this tests showed that:

- ProQ needs the 1.41 Q correction!

- EQ-s produce kind of similar results, but not very perfectly.

- The macOS included AUNBand is doing a fine job, at least it is more similar to ProQ then EQApo. It might not necessarily mean good nor bad though.

Is there a reference 10 band parametric EQ which we can use to compare with?

If someone needs it, I'm happy to share my files or settings I used.

I used DeltaW with the following config and I selected Yes when it asked for "simple sine wave" (

@pkane is this right?):

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