@dadork
If the goal is to have the best possible 2-channel sound (first), then only focus on the 2-channel rig to start. Per REL, their recommendation is to use the Neutrik connection and dial in the subs. Once you've done this, ALSO connect the .1 LFE connection and run your HT receivers setup routine (Audyssey?). Audyssey should now detect that you have a sub connected to the LFE output(s). It should also detect/set the main L&R front speaker as "large" singe they have a high-level sub connected to them to provide bottom end. If needed, set the front L&R speakers as "large" if you have the subs connected via the Neutik cable.
Does your HT receiver have just one, or two .1 LFE sub outputs?
If the goal is to have the best possible 2-channel sound (first), then only focus on the 2-channel rig to start. Per REL, their recommendation is to use the Neutrik connection and dial in the subs. Once you've done this, ALSO connect the .1 LFE connection and run your HT receivers setup routine (Audyssey?). Audyssey should now detect that you have a sub connected to the LFE output(s). It should also detect/set the main L&R front speaker as "large" singe they have a high-level sub connected to them to provide bottom end. If needed, set the front L&R speakers as "large" if you have the subs connected via the Neutik cable.
Does your HT receiver have just one, or two .1 LFE sub outputs?