From CalBears.com Fans Placed First at Renovated Stadium:
The renovated stadium features one of the very first installations of a new Meyer Sound product developed to provide a much clearer sound for fans while reducing the impact on the surrounding neighborhoods.
In place now are 38 "CAL" (column array loudspeakers) units installed around the outside rim of the facility steering down into the bowl. These units direct sound into the stadium using advanced digital sound beam-steering techniques and each tower is digitally aimable to project sound to a specific area with impressive clarity. Holloway described the difference in the new and old sound systems as "going from a small boom box to a state-of-the-art sound system in your house."
What are these CAL units? Ready to geek out on audio technology?
This Q&A and video at Meyer Sound describes the 38 column array loudspeakers installed in the California Memorial Stadium upgrade. Cal research directly helped with the beam forming technology used in the speakers:
Q: How did research with the Center for New Music and Technologies (CNMAT) help advance the beam forming in CAL?
McMahon: We worked with CNMAT at the UC Berkeley to model various types of beam forming. And this allowed us to create a prototype in an icosahedron, which is a 20-sided loudspeaker. It has 120 small 1 1/4 inch drivers to replicate the radiation pattern of any sound source. This research greatly advanced our understanding of grating lobes, maximum frequencies, how tightly we had to pack the drivers, and the types of processing required.