Clark W. Griswald here, answering your home improvement questions... Do you really want to listen?
In Colorado, we have expanding soil, so by code we are required to float our walls. Yes, most of the weight is hung from the ceiling.
In this pic you can see 2 different ways I hung them:
On the left is a normal attached wall, nailed right to the joists, on the right is an isolated wall of the theater, where I used RSIC clips to hang from the ceiling. The clips are spaced every 2 feet along a joist, and every 19 inches crossing the joists (since that was the spacing from joist to joist).
The bottom of the walls are where the float occurs by our code. There is a base plate securely attached to the ground (pressure treated is against concrete), then the base of the wall that is floating is 1 1/2 inches above it. You drill through the floating wall and pound a 60p nail through it into the baseplate. Make sure the wall is plumb before sending the spike all the way through. As soon as there are 2 spikes through the wall, it moves no more.
Here you can see the float, normally there is no Mass Loaded Vinyl (MLV) around the gap, that is just for my sound isolation purposes. About every 2 stud cavities there is a spike through the baseplate.
Check your code requirements for if you need to float your walls, if not, sound isolation will be a little easier (no MLV on the baseplate). Floating with the clips though from the ceiling would really help with isolation. On that first pic, if I strike both walls with a hammer, and go listen upstairs, the impact noise is reduced approximately 60%.
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