Measuring both subs together also worked fine. Problem when combining this with crossover seems to be that sub dropped exponential at the lower part of the frequency range. I suspect this is due to dramatic usage of PEQ. When setting subs gain back to 0dB instead of +6dB; with flat curves on both subs - this seems to be working with crossover against subs resulting in a flat curve. Reason for trying the +6dB was to hopefully achieve flat sub curves above 120Hz; to enable moving the crossover higher; and to remove the need for positive gain on the PEQ.
HT: Trinnov Altitude32 (AL32-1632)/Amplitude8/8M - BRYSTON 4B SST2 - B&W 802D3, 803D2, 2*DB1, HTM2D2, 804D2, SCMS, Nautilus SCM1, 805D2 - NORDOST Heimdall2/Frey2 - ISOTEK EVO3 Titan,Sigmas - LG OLED65B7V - GIK ACOUSTICS
HP: 2*MOON 430HA D, 2*MiND2 Network Player - 2*Yggdrasil - 2*Hydra Z/ZPM - ISOTEK EVO3 Sigmas, Aquarius - NORDOST Heimdall 2 - AUDEZE LCD-4 rev2, 2*LCD-XC - SHURE SE846