Two things have come to my mind over this last week that I wanted to share with you. So often I find people that have a hard time with the lower laryngeal idea because they tend to lower the larynx by pressing it down aggressively with the tongue and making a fake dark sound.
I would suggest to you a real expansion of the lower chest and when you do so to feel almost like your whole trachea is being lowered by this action. In order to not get tensions you really have to expand the sternum. Then the throat opens nicely and the larynx stays low.
This is a nice set up to get your voice to open up more and to originate low. What you need to guard yourself against is letting your voice sink deep into throat rather than leaning it respectively on the hard palate (middle and low) and in the sinus cavities. Also, you have to guard yourself against just “spraying” a wide crazily unorganized sound upward. You have to think in terms of laser sounds.
This sets you up to have a low larynx, open throat sound, that is highly harmonic. This hooks up to the power of the breath in a very unique way. This is old school.