I tried both, with rear ported speakers on a side wall and between at the back wall.
My ideal thought would be to have the power amp in the middle (if stereo) or closest to speakers (if mono) with shortest speaker cable length and longer interconnect leading to a side wall equipment stand placement.
Having not tried the different cable length but comparing with same length I could not tell the difference it made to the sound (even at high volume) with placement at side wall or between at back wall.
My current set up (in a new room) has the equipment in between on the back wall. My observations are similar sound but varing degree of change to the sound when trying out any new isolation product.
My ideal thought would be to have the power amp in the middle (if stereo) or closest to speakers (if mono) with shortest speaker cable length and longer interconnect leading to a side wall equipment stand placement.
Having not tried the different cable length but comparing with same length I could not tell the difference it made to the sound (even at high volume) with placement at side wall or between at back wall.
My current set up (in a new room) has the equipment in between on the back wall. My observations are similar sound but varing degree of change to the sound when trying out any new isolation product.