Seriously, lots of crap out there for BIG bucks. I've had excellent results by simply placing a common brick (not the silly VPI one) on top of each component, with felt pads in between to prevent scratching.
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Different cones do sound different, assuming the resolution of a particular rig is good enough to reveal it.
Different placement of same cones also sounds different.
Different shelves sound different & the suspension in use also changes sonic charactaristics.
Glass shelving or glass doors on equipment cabinets typically sounds degraded.
If you only "think you hear a difference" then it's subtle at best, perhaps only psychoacoustic. If no changes are perceived then the tweak doesn't work for YOUR system; doesn't mean it won't work in another rig.
Sub-bass control issues are different from mid & lower bass; muddying of sub-bass in a home theater rig may even sound desirable to the uninformed consumer.