when u center the felt, the first order direct low freq waves are flatwalled
causing massive sonic impact to be felt directly by the ear.
The sense of space n depth is traded off..for weight n power.
( like a car slamming into a wall...
)
when u lower the felt, below the direct listening line,
the low freq are focused by the felt, after bouncing off tangent afew times
givng a natural sense of floor weight further away,
and spaciousness of the stockMikros is retained.
( like a car ricocheting in 3D crashing..)
The chiral-transmitancy-absorbency coefficent of the select choice of felt / leather / blue tac are plastic-synergistic,
so anyone can safely plaster away, and get reasonably congruent results.