I take it you excelled in classes on succinct writing, but unfortunately I did not: What is a “price” stage? “Decoupled” from what? What is a “sample of work?”
It appears you’re talking about a DIY sub, but your post is too vague to tell for sure. But if that’s the case, some rubber feet will keep it in place and keep it from “walking” around due to vibration. It will work for subs placed behind or in front of the screen, and for stages with or without sand, for price stages as well as regular ones, and for stages decoupled from I’m not sure what.
Regards,
Wayne A. Pflughaupt