One of the features of the first years of Pine Knob was the entrance way to the amphitheater. Long cement retaining walls that cut through the hill/lawn were professionally hand-painted with the logos of every artist or group that had performed there. The walls were filled in and replaced by stairs and more lawn seating during the early 1980s, thus increasing the amphitheater's capacity to more than 15,000. The original sound system was novel in its day, a huge theatrical performance system designed for an outdoor theater with a custom console and large-array distributed speaker system.