OP - I am not introducing anything new here. But from one recently new to the hobbiest to another, some of the suggestions from here that I followed:
I tried elevating speaker cables - more noticeable for me on thicker heavier and longer cables. Currently using doubled and tripled up styrofoam cups due to the weight. Things sounded airier, a bit more defined.
Cones - Jury's still out on the "how", but after placing them under seemingly good rubber footing (both really heavy monoblocks and light DACs), I cannot deny some improvement.
Subwoofer placement - perhaps the best and most significant overall tweak! Short of adding additional LF sources, do not dismiss placement if you are using one or more. I added more with excellent results in a 10 x 14 room where only one sub couldn't work.
Btw. The light switch thing worked in my listening room!
I tried elevating speaker cables - more noticeable for me on thicker heavier and longer cables. Currently using doubled and tripled up styrofoam cups due to the weight. Things sounded airier, a bit more defined.
Cones - Jury's still out on the "how", but after placing them under seemingly good rubber footing (both really heavy monoblocks and light DACs), I cannot deny some improvement.
Subwoofer placement - perhaps the best and most significant overall tweak! Short of adding additional LF sources, do not dismiss placement if you are using one or more. I added more with excellent results in a 10 x 14 room where only one sub couldn't work.
Btw. The light switch thing worked in my listening room!