Any question answered...

I had a similar problem when I lived in a house share; fortunately I had two pairs of slippers (the big padded ones from most supermarkets, usually have a cartoon character stitched to the front) so just put one under each foot of the turbo - got rid of 90% of the turbo rattle & made it more secure on the wooded floor. I appreciate you may be after something a little more permanent but it could help for the short term.

Cheers, worth giving a go.

you haz a mezzanine.

Need turbo to be in front of the TV sadly. Mezzanine level would have been perfect.

An answer:
http://en.wikipedia.org/wiki/Sorbothane

You can also tweak the system by making sure the turbo support points are on a joist, and close to the wall, to maximise the rigidity of the support. This minimises the amplitude of the signal imparted to the sounding board, aka the floor surface.

Thanks mate. I'll look into this. Sounds like it could be the best way to isolate turbo from the floor.