How do I redirect my subdomains to a new domain altogether?

I have a domain set up as a multisite: http://freefloorvideo.com This website uses Wordpress.

I use subdirectories as in freefloorvideo.com/1a and freefloorvideo/2a.

I want to redirect these subdirectory websites to new domain.

For example: freefloorvideo.com/1a should redirect to http://freefloorvideo1.com and freefloorvideo/2a should redirect to http://freefloorvideo2.com.

I tried using two Wordpress plugins, Eggplant 301 Redirects and Source Redirect Site (one at a time, of course). Neither did anything.

How can I redirect my subdirectory domains to an entirely new domain without showing any content at all from the old subdirectory domain?

Thanks for your assistance.