Hi IM, in that discussion you say that the granite slabs should be 2 - 3 times the weight of the speakers. The Summits are 34kg (75lbs). So 100 kg slabs? How are you going to move it around if you want to adjust it
Ok, so I'll admit that in my posted link, I sound pretty Matter of Fact. I'm not a physicist though. I tried paving stones to tighten up the sound being produced by my Vistas. This was on carpet at my previous residence. It worked really well, so I purchased (2) three inch thick granite surface plates (used by machinists to verify the accuracy of precision measuring tools) to place under my speakers because:
a) they are more dense than concrete
b) they are more aesthetically pleasing than concrete
I have since moved to the top floor of a condominium, with laminate floors. Noise travelling through the floor is a potential issue, so I placed them under my speakers to reduce the amount of noise transfer into the floor, and my neighbours`ceiling. It worked perfectly. I mentioned that the slabs should be so and so heavier than the loudspeaker, but upon re-reading the post, it looks like non-sense.lol. However, look at it this way: The heavier the base under the speaker, the more stable it will be. Also, I think that it is logical to think that if something under your speaker (floor, block of whatever) can be made to transfer sound to somewhere else, you are wasting that energy being transferred to (somewhere else). In a butshell, the heavier the base, the more difficult it will be for your speaker to move it (the base), and the less energy wasted moving it (the base, floor, etc...)