[RSH]

One should be sufficient.

There are two ways of mounting the subwoofers:

1. one per chair
2. one or several in the platform (depending on the platform size).

The first method will give you more localized and precise effect. The Berkline offers this option in their recliners and installs them this way. It will work better with the subwoofer because of the fact that the single chair does not weight as much. The buttkickers are very fast, and there is not going to be any delay between the sound coming from the sub and the movement generated by the buttkicker.

The second method will give you more of a "whole room" shaking effect, but since much more mass needs to be moved may not be as precise.

You will find people who would like one method over another. I like the one per chair method better- it puts you right into the movie, and it works the best with your subwoofer.