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How much are you looking to spend? A Gramma can be had for about $50, which seems pretty reasonable to me personally, especially given that I don't have the resources to experiment with building something. You might try something like a set of Quest For Sound Isol-pads for $25. If they don't work as well for your sub as you'd like, you could always use them under another component.
This site has a lot of useful soundproofing materials that could be used to construct some sort of pad. I've thought about doing the same thing myself. You can even get sheets of lead and lead tape here.http://www.supersoundproofingsales.com/Vibration-Pads/products/25/
I've had pretty good success using Vibrapods for both large tower speakers and subs. They have a range of sizes to accommodate all loads and have then benefit of being movable to balance the speaker if the load is uneven. One word if caution though: the can leave a residue after a while so it's best to have something between them and the floor. I've used a piece of mdf cut to match the speaker size and this has worked well.
It may be some kind of "special" foam, but it can't be all that special. I honestly doubt they formulated the foam after doing extensive listening tests and measurements. They likely found materials already being made for other purposes and are just using various densities of it to construct their various products. I think Auralex would have a problem selling tennis ball halves for $50. This stuff isn't really rocket science, which is why you're finding that people have many different methods that seem to work in one way or another. Don't over think it. You can dampen vibration basically 3 ways - adding mass / weight, adding structure, or applying materials that absorb / diffuse vibrational patterns.Never tried this myself, but tennis ball halves must sort of add structure and also absorb / diffuse vibrations.
It may be some kind of "special" foam, but it can't be all that special. I honestly doubt they formulated the foam after doing extensive listening tests and taking more than just a few measurements using a few different types of audio equipment. They likely found materials already being made for other purposes (as this is FAR cheaper than a making a proprietary material) and are just using various densities of it to construct their various products. I think Auralex would have a problem selling tennis ball halves for $50. This stuff isn't really rocket science, which is why you're finding that people have many different methods that seem to work in one way or another. Don't over think it. You can dampen vibration basically 3 ways - adding mass / weight, adding structure, or applying materials that absorb / diffuse vibrational patterns.Never tried this myself, but tennis ball halves must sort of add structure and also absorb / diffuse vibrations.Auralex has found a niche making good quality, pre-constructed units. This doesn't mean their product is "the best" or only way to do things, but they've taken the guess work and construction out of the equation for people like me and others.
