Hi Todd,
Bill Morgan, Titleist's Senior VP of Golf Ball R&D, answered this question earlier this year during one of our Titleist Golf Ball R&D Live Webcasts.
Please click here to watch: http://www.titleist.com/teamtitleist/b/tourblog/archive/2011/05/09/video-replay-titleist-golf-ball-r-amp-d-webcast-the-facts-about-golf-ball-performance-and-fitting.aspx
Bill answers your question in Part 3 around the 6:25 mark.
Hope that helps.