Originally Posted by pentagon ➡️

Nope.
The ITU preset in Avid Downmixer shows center at -3 dB but the result is a -3dB per L and R.

The ITU preset of Spanner shows center at 0 dB change with a result of -3dB per L and R.

If you use the presets for both of these plugins and do not change anything, you will get the right result. It is always -3dB for Center as found in Left and Right, -3dB for Ls and Rs in the respective L and R channels, and LFE muted.

As I inked earlier, Netflix is fine with adding LFE in at a low level for their stereo fold down (so not the official ITU fold down)