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[Ivan Beaver]

Tim McCulloch wrote on Thu, 25 November 2010 22:24

Air space.  Say, 18-24 feet of it.

As the general rule to prevent sound transmission is as follows:
MASS-airspace-MASS (the 2 mass walls are not attached to each other), and airtight.

Anything else is a start to a compromise.

[Tim Padrick]

I think what the spikes do is minimize movement between the cab and the floor - the cab is no longer pounding on the floor.

Cab on floor - especially if there is carpet: Note the amount of energy you feel in the room and the amount you feel in your feet from the floor.  Now spike the cabinet - you feel more in the room and less through your feet from the floor (yes, I've done this).