Harry, the dip is measured, let me see if I can get hold of a screenshot of the sub plot and see what you think. I remember having some questions regarding how steep the G68 crossover is and it is 24dB/octave.

I have put it between the center and the right speaker. For music/Trifield it's only offloading the center speaker. For movies it handles all speakers bass below 53Hz.

DSP8000SE, DSP7200SEHC, DSP5200SE sides, DSP7200SE rears, 861v8, 210, Sim2 Ultranero 4, Stewart Cinecurve 2.35:1, XEIT CM-5E Anamorphic lens, Dune HD Duo Cinema 8K and Wireworld Platinum 48G HDMI -> UHD722 -> Shunyata Omega Ethernet. Shunyata/Furutech power-cables/filters. SR Master Fuse@861v8. Uptone Etherregen with 10MHz OCXO clock.