My subs are located in my listening room, which is above our garage. The flooring is particle board and framing (or whatever construction terminology is used), not concrete like our first story flooring. It is my understanding that the purpose of putting anything under the sub cabinets is to eliminate sound transmission from the sub cabinet into the room structure, but maybe I misunderstand the purpose.
In some videos that I've seen, they said spikes should not be used on my type of floor to prevent transmission of sound. If I use an absorptive material, like they suggest, then the center of gravity comes into play more than if rigid support like spikes are used. The carpet and padding are not enough, but it does indicate that the center of gravity is more towards the back. That's why I found Mike's design interesting, because I thought extending the back of the base would make the weight equal at all four corners.
I'm not worried about my speakers tipping over backwards, but I do think about more weight on the back corners than the front. If I use rubber disks, or other soft material, maybe it has an effect. I can easily build a platform to place the sub on that does what I want, so it's not a big deal. I just thought this would be an interesting discussion to have.
Is an absorptive material what I should use with my floor type? If so, what would be the best material? I'm sure there's a hundred ways to do it.
And, because I bought the spike option, I can easily put them on and see how well they work. This is the fun of the hobby....experimenting with all this.
