Yorkville YSC MOBILE 60th Anniversary Battery Powered SpeakerCommemorate Yorkville Sound and Traynor Amps' 60th Anniversary with a modern twist on the speaker that launched a revolution in portable live sound. In the early sixties Long & McQuade's then service tech, Pete Traynor, designed and produced two road worthy column PA speakers, dubbed YSC. The resulting Yorkville speakers comprised the first known portable column PA system, soon to be commonplace on stages around the world. Sixty years in, Yorkville