Subwoofer "Rattling" Across Floor/Pad

[haw1144]

I tried doing a search but couldn't find what I'm looking for... maybe I'm not using the right words to describe it.

I have a fairly heavy sub... and I run it a little hot. I have hardwood floors and originally used spikes/discs. But during really intensive bass sessions, I could hear the sub rattling along the floor, eventually causing the subwoofer/spikes/discs to slide along the floor.

Definitely a buzzkill... so I ordered the Auralex Subdude. Problem solved! No more ugly rattling. The sub is on the Subdude... completely flat (no spikes used).

But now I noticed that during intensive bass sessions, the sub kinda makes a wobbly noise... and I notice that the sub has shifted position on the Subdude. Being paranoid it would eventually move itself off the pad, I reposition every now and then.

Any ideas/suggestions? If I lean onto the sub doing those heavy LFE scenes, it sounds fine. Is my sub not 'heavy' enough? Should I use spikes with with the Subdude?

I was tempted to use some leftover BlueTac I have to kinda hold the sub and Subdude together.