I think LEDR came out of the research that the Canadian Government funded back in the 80's.

For me, it helped identify the ceiling of my room as a problem spot. I played around with acoustic treatment on the walls until things sounded right. Diffusion won out over absorption.

Living room: 818v3, Parasound A23+, Maggie 1.6
A/V room: 861v8, DSP7200SE L/R/C, 4x DSP320 surrounds, ID41 + Roon, UHD722, Prime+PS