LAS VEGAS--(BUSINESS WIRE)--South Hall 1, Booth #21012 – SMS Audio, LLC (www.SMSAudio.com), a premier audio headphone and accessories brand from Curtis “50 Cent” Jackson, announces that NFL player, Rob Gronkowski, joins SMS Audio as a global brand ambassador. Announcing the news at CES 2015, Gronkowski will promote the brand by way of social media as well as provide support via advertising campaigns and other marketing initiatives. “As an athlete, I’m always on the hunt for the best fitness gea