It was a cloudy day, and I had some NXT-Tour-S amber balls. After 10 holes I switch to Pro-V-1x (v.2013). On my first drive, the 1x and 913 D2 had a distinct crisp sound. Every release of balls from every company is coming out with new and improved softer balls. I hope Titleist doesn't continue the trend with the 2017 Pro-Vs. I really like the distinct feel on on center hits.