Here is my take on the EQ.
The reviews are rather positive and I am not quite sure if the EQ will actually yield an improvement but that an interesting test to perform nonetheless. I am somewhat skeptical about it but it seems that some good people might be able to test it.
@renaudrenaud,
@daftcombo
The raw data with corrected ER and PIR:
Score no EQ: 5.68
With Sub: 7.76
Spinorama with no EQ:
- Generally flat response except around 4k, which is definitively something related to the off axis behavior of the speaker. It looks to me as a typical case of deliberate voicing i.e. deviation from flatness to smooth out the PIR.
the Horizontal normalized network of curve is quite telling.
- The directivity is decent, good candidate for EQ
- Decent LF for the size with mild boost in the 100-300Hz range
- 500-1000Hz range quite jaggy, not sure why
View attachment 96881
Directivity:
Better stay at tweeter height.
Horizontally, better toe-in the speakers by 10/20deg and have the axis crossing in front of the listening location, might help dosing the upper range.
View attachment 96853
View attachment 96861
Normalized data:
View attachment 96856
EQ design:
The
APO config file is attached.
- The loudness between the EQ and bare version is rather different so careful set up of the preamp gains is required for ABX listening tests
- The EQ does not try to fatten the response ON around 4kHz as it would have negative impact on the PIR. This is not a target that I set but the result of the evolutionary optimization. In fact the flat LW original population seed has a significantly lower score (6.04). The designer seems to have been correct when designing the Xover, well done.
Score EQ: 6.44, quite respectable!
with sub: 8.52
Code:
Elac DBR62 APO EQ 96000Hz
December022020-121023
Preamp: -1.3 dB
Filter 1: ON HPQ Fc 31.6 Hz Gain 0 dB Q 0.85
Filter 2: ON PK Fc 169.5 Hz Gain -2.33 dB Q 0.67
Filter 3: ON PK Fc 573 Hz Gain 0.81 dB Q 3
Filter 4: ON PK Fc 630 Hz Gain -2.2 dB Q 11.4
Filter 5: ON PK Fc 843 Hz Gain -2.69 dB Q 2.55
Filter 6: ON PK Fc 1769 Hz Gain 1.51 dB Q 2.22
Filter 7: ON PK Fc 5813 Hz Gain -0.67 dB Q 1.11
View attachment 96875
Spinorama EQ
View attachment 96879
Zoom PIR-LW-ON
View attachment 96877
Regression - Tonal
The PIR regression suggests that the speaker sounds larger than its size.
The slope is about 8dB from 100 to 16000Hz compared to the more common 6dB of the EQ version.
Howe ever the ON regression is now flat.
View attachment 96876
Radar no EQ vs EQ score
Some improvements
View attachment 96878
The rest of the plots are attached.