The blue one was made for Soundstream, I think. I have the 5's and 4's- bought them at a Parts Express buyout. hey were for the Exact 6.3 components. Paired with the D26 tweets made a real nice set.
http://www.soundstream.com/manuals/speakers/exact/63/63.PDF
http://www.soundstream.com/manuals/speakers/exact/63/63.PDF