Yeah, that's the kind of thing I was talking about. One of the bass players I do a lot of work for uses something like that under his bass amp. I'm not sure what brand his is, but it's basically the same kind of thing if not the exact thing. It does wonders for tightening up his bass by preventing direct mechanical vibration from translating to the floor and turning the floor into one big driver. If your studio is located in the basement and you're on a concrete foundation slab, it may not be as necessary, but it certainly couldn't hurt. If you're on anything else (including a flexicore concrete floor even), I'd highly recommed it.
G.