Wow, this proved to be a tough one. I saw their demo and the bitchen slider they had in there. I downloaded their theme and installed it on my development site, never found that slider in the theme files.
I looked at templated pages, theme options, and widgets. The closest I could come was to download a slider plugin (used responsive slider), install and configure a few slider image, then added [responsive_slider] shortcode into a text widget, then draged that widget into the ‘Wide’ widget area.
The shortcode wouldn’t fire off without my editing the themes functions.php file and adding:
// Activate Shortcode for sidebar widgets
add_filter('widget_text', 'do_shortcode');
I didn’t get their exact look, but I got close. The problem I ran into was the text widget inhibited my banner from going full width. I suppose if I wanted to dink around some more, I could find a slider that has its own widget that will me get an unhindered 1140px wide slider image.