Hello Griffith
No apology necessary for asking a perfectly legitimate question. Looking at the physics of the riser/mopad, it would reduce or suppress mechanical vibration of the subwoofer cabinet or the VP180 enclosure from being transmitted to the surface below.
However it would do nothing to prevent the acoustical vibration generated by the subwoofer's sound waves or the VP180's acoustical output from resonating the floor or surface beneath the center channel, respectively. To claim otherwise would contradict fundamental rules of science and the propogation of sound waves.
You could accomplish the same end by using four tennis balls under the subwoofer or those squishy rubber balls under the VP180. However, they would look peculiar---if you could see them.
Regards,
Alan
