The EQ settings for my Quad electrostatics are:
ROON REW-Rephrase
Band 1 300 Hz 3.0 dB Q 2.0 Q 2.38
Band 2 1200 Hz 1.0 dB Q 8.0 Q 8.47
Band 3 2000 Hz -2.0 dB Q 2.0 Q 2.24
Band 4 3500 Hz 1.0 dB Q 8.0 Q 8.47
Band 5 4500 Hz - 3.0 dB Q 7.0 Q 8.32
Band 6 6000 Hz 2.5 dB Q 4.0 Q 4.62
Band 7 11000 Hz 3.0 dB Q 8.0 Q 9.51
Band 8 16000 Hz 5.0 dB Q 0.4 Q 0.53
Band 9 20000 Hz 7.0 dB Q 1.0 Q 1.5
Although I own the latest Quad ESL 2812; these settings can be used for the ESL 63, 988, 989, 2805, 2905 and the 2912 as well.
I used a lot of articles, measurements and reviews to come to these conclusions and it has nothing to do with the acoustic environment.
Pure compensation; best worded by the review of the Quad ESL 2812 in The Absolute Sound May 31st 2016.
I also mounted May 2020 Iso-Acoustics Gaia 3 (€ 250) on the back and Iso-Acoustics Gaia 2 (€ 350) on the front of the ESL speaker. For € 600 a super-modification.
Sounds superb!
Above settings are my main txt files; in the alternate files are the corrections for my Stax 507 headphones now.
Good listening!
ROON REW-Rephrase
Band 1 300 Hz 3.0 dB Q 2.0 Q 2.38
Band 2 1200 Hz 1.0 dB Q 8.0 Q 8.47
Band 3 2000 Hz -2.0 dB Q 2.0 Q 2.24
Band 4 3500 Hz 1.0 dB Q 8.0 Q 8.47
Band 5 4500 Hz - 3.0 dB Q 7.0 Q 8.32
Band 6 6000 Hz 2.5 dB Q 4.0 Q 4.62
Band 7 11000 Hz 3.0 dB Q 8.0 Q 9.51
Band 8 16000 Hz 5.0 dB Q 0.4 Q 0.53
Band 9 20000 Hz 7.0 dB Q 1.0 Q 1.5
Although I own the latest Quad ESL 2812; these settings can be used for the ESL 63, 988, 989, 2805, 2905 and the 2912 as well.
I used a lot of articles, measurements and reviews to come to these conclusions and it has nothing to do with the acoustic environment.
Pure compensation; best worded by the review of the Quad ESL 2812 in The Absolute Sound May 31st 2016.
I also mounted May 2020 Iso-Acoustics Gaia 3 (€ 250) on the back and Iso-Acoustics Gaia 2 (€ 350) on the front of the ESL speaker. For € 600 a super-modification.
Sounds superb!
Above settings are my main txt files; in the alternate files are the corrections for my Stax 507 headphones now.
Good listening!
1: Atelier d'Or no.75 (1.5m. AQ RCA-XLR), 
2812 QuadESL.nl, Kimber 8TC, WBT, Rel StentorII, Oppo105D (surround), Vodafone Next, Quad 303.2(!Quadrepair.nl), Kef RDM1, BenQW4000i, SBooster (3x), IfiX 3x, 125 inch, Stax 507 (2x) on Stax SRM-1S, SRM D-50, all on Iso-Ac. Gaia1, 2 and 3, Kemp Isolator source and power-, Kemp QA/ SNS plugs (6x), Furutech & ALAC maincables, AQ Blizzard, Van den Hul Mainstream, Optical 8k cables, Clearaudio (Synchro+Champion2+TT3 tangential+CM Bearing+Outer Limit+StradivariV2, 530uV, 200 ohms), NUC11 i7, Samsung-980Pro, -A8, -S24Ultra, Roon Life, Netgear 108, AQ Cinnamon all, Live cable USB, AQ jitterbug 5x, WB 18TB 2x
2: 220Pro, Kef R3, Rel Studio, Oppo103EU (surround), Quad 707(mod), Kef RDM2, all on Iso Acoustics 200, Gaia 3 & 1, LG Oled55, Furutech wall outlets(3x), AQ NRG-Z3 (2m., 5x), Kemp powerstrips, Audiotool filters, Oppo HA2+PM3 + AQ cinnamon cables
1900 recorded LP's 24/192, 850 DSD 5.1 SACD (via Oppo), 4800 ripped CD's, Qubuz
2812 QuadESL.nl, Kimber 8TC, WBT, Rel StentorII, Oppo105D (surround), Vodafone Next, Quad 303.2(!Quadrepair.nl), Kef RDM1, BenQW4000i, SBooster (3x), IfiX 3x, 125 inch, Stax 507 (2x) on Stax SRM-1S, SRM D-50, all on Iso-Ac. Gaia1, 2 and 3, Kemp Isolator source and power-, Kemp QA/ SNS plugs (6x), Furutech & ALAC maincables, AQ Blizzard, Van den Hul Mainstream, Optical 8k cables, Clearaudio (Synchro+Champion2+TT3 tangential+CM Bearing+Outer Limit+StradivariV2, 530uV, 200 ohms), NUC11 i7, Samsung-980Pro, -A8, -S24Ultra, Roon Life, Netgear 108, AQ Cinnamon all, Live cable USB, AQ jitterbug 5x, WB 18TB 2x2: 220Pro, Kef R3, Rel Studio, Oppo103EU (surround), Quad 707(mod), Kef RDM2, all on Iso Acoustics 200, Gaia 3 & 1, LG Oled55, Furutech wall outlets(3x), AQ NRG-Z3 (2m., 5x), Kemp powerstrips, Audiotool filters, Oppo HA2+PM3 + AQ cinnamon cables
1900 recorded LP's 24/192, 850 DSD 5.1 SACD (via Oppo), 4800 ripped CD's, Qubuz
