Well, not exactly no bass, but a whole lot less. I figured I'd give the spikes on my Zu Minimethod a try just to see if they would tighten things up or what (before I had on just rounded metal feet), so I put them on and put my sub back in its normal place and cued up various tracks that I know have some clean bass on them. Maybe this is old news to people, but to my surprise, the bass that was usually full and powerful was now anemic and weak; I turned the sub's level up all the way and it still didn't even begin to pressurize the room, even with the volume turned up! Keep in mind, this is all in a small room, but I think the key factor here must be that I have no carpeting and thereby probably no need for spikes, and I also have a thin layer of wood resting directly on a concrete floor, so the foundation in my room is pretty much rock solid.
I switched back to the regular rounded off metal feet and instantly, the bass returned to its normal full self. I thought this was an interesting outcome that I personally wasn't expecting, I never knew footers could impact the sound this much, but I just thought I'd post my findings here for anyone interested, I imagine I'm not the first to find this out...