Ok, I will rephrase it.
Carpet padding.
The earthquake effect I mean when you jump in the room all the objects in that room will shake. Sorry I can't explain it better.
Wobbly: tending to move unsteadily from side to side.
I'm replacing carpet with laminate flooring.
My subfloor is close to 20mm lower than the door, maybe a little more.
My plywood is also really wobbly, not creaking.
Earthquake effect while the carpet underlay is already down.
How do I fix these two problems.
Is underlay cheaper...