Generate 9-band graphical EQ suggestion for use with AVRs, in addition to 15 and 31 band?

[article10]

I own these speakers which definitely would benefit from some equalization: https://www.spinorama.org/speakers/Wharfedale%20EVO%204.1/ASR/index_asr.html

The Spinorama website shows 15 and 31 band graphic EQ suggestion. But the AVRs from Denon/Marantz only have a 9 band EQ.
https://support.denon.com/app/answers/detail/a_id/14882/~/avr-supporting-a-manually-adjustable-graphic-eq

Basically the graphic EQ only allows adjustment of 63 Hz, 125 Hz, 250 Hz, 500 Hz, 1 kHz, 2 kHz, 4 kHz, 8 kHz and 16 kHz in 0.5 dB increments (so 0, plus or minus 0.5, 1.0, 1.5 dB etc.)

See the photo here for what it looks like on my X2800H:

For now I'll try -1 on 250 Hz, -1.5 at 5 kHz, and then +0.5 at 16 kHz.

But I think a proper calculation of the 9 fixed bands could for example show that I'd need to bump 2kHz a bit to create a narrower downward curve to tackle that 4kHz boost?

Amir of ASR mentioned -2 dB at 200 Hz -4 dB at 3900 Hz and +2 dB at 7000 Hz

It would be great if the website would calculate how to set those fixed bands of EQ, in the 0.5 dB increments.

For example for the Emotiva B1+ it could say to drop the 1000 Hz by 1-2 dB but to not touch the 8 kHz slider because the peak there is too narrow for this wide band equalizer to handle.
https://www.audiosciencereview.com/forum/index.php?threads/emotiva-airmotiv-b1-review-bookshelf-speaker.22366/

If someone wants to give 9-band EQ suggestions for the Wharfedale Evo 4.1 or Emotiva B1+ that's fine too.

Next time I'm getting a Pioneer AVR because I've read the MCACC system allows customizing the parametric EQ bands.

[pierreaubert]

One of the missing data is the Q for each band? I have assumed 1 octave since i did not found it the manual.

[article10]

Thanks!
I wasn't able to find an authoritative source from Denon/Marantz, but it seems 1 octave (Q 1.41).

_usually octave-spaced graphic EQs have a Q-factor of sqrt(2) = ~1.41 (= bandwidth of 1 octave).

We can tell that this EQ has is octave-spaced, because the frequency of each filter band is twice as high as the frequency of the filter band_

https://www.reddit.com/r/headphones/comments/1bxzpi9/comment/kyh6xw3/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button

if the frequencies of the individual filters are one octave apart (meaning: the frequency of filter band 2 is exactly twice the frequency of filter band 1), then the bandwidth of the filters will likely be 1 octave (Q=1.41).
https://www.reddit.com/r/oratory1990/comments/j0ys42/comment/jdeneg4/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button

[article10]

Is this sufficient information? :)