Addicted to Fun and Learning
- Jul 1, 2017
That is a lot of parametric EQ being applied to the response of this loudspeaker, some of it with relatively high Q values. Considering that the loudspeaker seems to have a wide built-in dip, about 2dB in magnitude centered on 2kHz and covering two octaves, I'd expect that a single parametric EQ filter in that region could suffice to bring up the energy to be relatively flat on axis. Wouldn't many of the other small peaks and dips be caused to a large extent by sound diffraction effects. I am concerned that EQing individual peaks and dips resulting from diffraction effects is not entirely a good idea.
for this speaker you can decrease the Q to 4 and get similar results:
SPK auEQ ----------------- NBD ON 0.39 0.39 NBD LW 0.30 0.30 NBD PIR 0.28 0.25 SM PIR 0.80 0.93 SM SP 0.86 0.94 LFX 51 51 LFQ 0.43 0.43 ----------------- Score 5.4 5.8 -----------------
EQ for Wharfedale Diamond 12.1 computed from ASR data Preference Score 5.4 with EQ 5.8 Generated from http://github.com/pierreaubert/spinorama/generate_peqs.py v0.11 Dated: 2021-09-23-06:07:46 Preamp: -2.6 dB Filter 1: ON PK Fc 1743 Hz Gain +2.29 dB Q 3.15 Filter 2: ON PK Fc 2453 Hz Gain +0.82 dB Q 4.00 Filter 3: ON PK Fc 14143 Hz Gain +0.50 dB Q 1.97 Filter 4: ON PK Fc 10225 Hz Gain +0.50 dB Q 4.00 Filter 5: ON PK Fc 2744 Hz Gain +0.50 dB Q 4.00 Filter 6: ON PK Fc 398 Hz Gain -0.72 dB Q 0.20 Filter 7: ON PK Fc 4538 Hz Gain -0.94 dB Q 1.67 Filter 8: ON PK Fc 1210 Hz Gain +0.75 dB Q 4.00 Filter 9: ON PK Fc 1635 Hz Gain +0.50 dB Q 4.00
Looking at the result on the PIR: you could probably get the same result with increasing the max DB around 2kHz. Here the EQ lower the
bass-midrange by 1 dB then plug the 2khz and down a bit the next bump at 4-5kHz.
What would be useful is to have the phase data too. Where the speaker is not min phase (group delay not flatish) then EQ with IIR is
not useful. So usually I expect IIR to not be efficient across crossover areas.
Last, the EQ is produced but an atomiser which naturally tries to optimise for small defects too.
I cannot test most of this EQs since I do not have the speakers, I was happy with the result with a few I have access to (JBL M2, Focal Solo 6 etc). Customer feedback is welcome!
The current max Q == 6 has been chosen because it is my limit to detect an audible change and also because likely variation model to model
are larger than the precision of the measurement.