Can I display the admin bar logo on just the subsites and not on the main blog

When using the ultimate branding plugin is there a way to display a logo in the admin bar on all the subsites of a multisite network but not on the main site. The reason is the main site already has a larger logo being used through the theme and having both images displayed doesn't look right. If anyone can tell me how to block the admin bar logo on the main site I would appreciate it. Buddypress is also network enabled if that makes a difference.