ribbon board was then added above the north stands in 2014. Both the video and ribbon boards display game statistics and information, out of town scores, along with graphics, animations, crowd prompts, and opportunities for partner-related elements. A new custom audio system, which is integrated with the video and scoring system, was also installed and engineered to provide full-range sound reproduction and deliver clear and intelligible speech at Martin Stadium. In time for the 2014 season, the concrete wall that separated the playing field from the stands was faced with brick, and galvanized steel railings painted black to give the stadium a more traditional feel and to architecturally integrate with the exterior finish materials used on the new Cougar Football Complex. Playing surface The current playing surface is Revolution Fiber by FieldTurf, installed in the summer of 2014 as part of the budget inclusion for the $61 million Football Operations Building. Rev Fiber is the latest and most realistic grass-like surface available, also used at Ohio State and Notre Dame, and the NFL's CenturyLink Field and Gillette Stadium. Rev Turf has received a FIFA 2-star rating for soccer. FieldTurf was first installed in 2000 and replaced in 2006, preceded by the sand-filled Omniturf of 1990. The original playing surface at Martin Stadium in 1972 was AstroTurf, replaced by SuperTurf in 1979, and again in 1984. The playing surface at Rogers Field was natural grass. The elevation of the field is approximately above sea level, which was the highest in the Pac-10, but is a distant third in the Pac-12. Goalposts Martin Stadium is one of only three in the FBS (formerly Division I-A) which uses goalposts with two support posts for all of its home games. The others are Doak Campbell Stadium at Florida State and Tiger Stadium at LSU. Single-support goalposts were torn down at Martin Stadium in 1982 and 1988, after Apple Cup victories. The double posts at Martin debuted with the Omniturf in 1990, and the Cougars were trounced in the Apple Cup. The distance between the uprights was narrowed for college football in 1991 to , matching the NFL. By the next Cougar victory in the rivalry in 1992, double posts were in place for the win in the snow. Apple Cup Washington State hosts the Apple Cup rivalry game with Washington in even-numbered years. Except for 1954, the Apple Cup was played at Joe Albi