If you're interested in EQ'ing your Diana V2 this might be useful.
I recreated Judes measurements on
Squiglink using the existing measurements by unheardlab. Judes measurements are the most accurate I've seen so this is a good place to start. I didn't change the bass region as it seems Jude didn't get a perfect seal here.
If you want to do this yourself you can use the following settings;
Preamp: -12.8 dB
Filter 1: ON PK Fc 1200 Hz Gain -0.8 dB Q 1.000
Filter 2: ON PK Fc 3050 Hz Gain 4.0 dB Q 2.000
Filter 3: ON PK Fc 5800 Hz Gain -8.0 dB Q 6.000
Filter 4: ON PK Fc 6450 Hz Gain 8.6 dB Q 6.000
Filter 5: ON PK Fc 7300 Hz Gain -4.0 dB Q 7.000
Filter 6: ON PK Fc 9500 Hz Gain 13.0 dB Q 5.000
Filter 7: ON PK Fc 12500 Hz Gain -5.6 dB Q 6.000
Black - Judes measurement on the Bruel and Kjaer 5128
Red - Gras 43AG-4 measurement with EQ applied
Once you have this set up you can EQ to your preference by adding new bands (don't change any of the existing bands you've created). After a bit of trial and error I landed on the below settings. I feel this opens up the stage, gives vocals a more accurate timbre and adds snap and impact to drums. The general tonality sounds more correct without losing the Diana V2 magic. Note: I'm using the standard Suede pads.
Preamp: -2.35 dB
Filter 1: ON PK Fc 20 Hz Gain 0.8 dB Q 1.8
Filter 2: ON PK Fc 90 Hz Gain 2.1 dB Q 0.4
Filter 3: ON PK Fc 460 Hz Gain -0.9 dB Q 1.41
Filter 4: ON PK Fc 1300 Hz Gain -1.6 dB Q 1.41
Filter 5: ON PK Fc 2200 Hz Gain 0.5 dB Q 2.84
Filter 6: ON PK Fc 3100 Hz Gain -1.6 dB Q 4.94
Filter 7: ON PK Fc 4500 Hz Gain 2.7 dB Q 2.84
Filter 8: ON PK Fc 6550 Hz Gain -2.6 dB Q 6.4
Filter 9: ON HS Fc 8200 Hz Gain -0.8 dB Q 1
Filter 10: ON PK Fc 9500 Hz Gain -1 dB Q 4.94
This looks like this;
Enjoy!!