KICKER is an American consumer electronics manufacturer that produces home/portable, marine and mobile audio products, and are best known for their subwoofers, as well as their audio crossovers and the amplifiers that supplement them. Kicker is known for its high production of square loudspeakers. Kicker Audio products are designed and manufactured by Stillwater Designs Inc, which is headquartered in Stillwater, Oklahoma. Kicker is considered by many to be one of the pioneers of the car audio industry.