THX™ Certified Ultra2
The ultimate technology standard for movies and music.

The Velodyne subwoofers that are THX Ultra2 Certified include models from our Digital Drive Series and HGS Series:

Model	Status	Category	Region
DD-15	Certified	Ultra 2	Worldwide
DD-18	Certified	Ultra 2	Worldwide
HGS-15	Certified	Ultra 2	Worldwide
HGS-18	Certified	Ultra 2	Worldwide

THX certification standards are designed with a simple purpose: to maintain all the nuance and dynamics of an original movie soundtrack when reproduced in your home. Before any home theatre component can be THX Ultra2 certified, it must pass a rigorous series of quality and performance tests. Only then can a product feature the THX Ultra2 logo, which is your guarantee that the Home Theatre products you purchase will give you superb performance for many years to come. THX Ultra2 requirements cover every aspect of the performance of the product including power output, frequency response, distortion, etc.

To find out more about THX, click here.