Sounds like what you need are two white DECAs for your receivers.
Ebay may have these cheaper:
http://www.google.com/products/cata...a=X&ei=3Tk3T8LVCqiIiAKIq5GDDg&ved=0CF4Q8wIwAA
Ebay may have these cheaper:
http://www.google.com/products/cata...a=X&ei=3Tk3T8LVCqiIiAKIq5GDDg&ved=0CF4Q8wIwAA