Thumbnail question

On the home page I want to display the thumbnail preview only on the featured posts section at the top, but not for the listing of posts underneath. Is this possible? Visit the site below to see what I’m talking about. Currently all thumbnails are turned off in the theme’s settings. If I turn them on they display in the featured posts section and in the normal post section below, so it comes up twice.

http://www.bangerzonly.com