The Boardwalk Hall Auditorium Organ is the pipe organ in the Main Auditorium of the Boardwalk Hall (formerly known as the Atlantic City Convention Hall) in Atlantic City, New Jersey, built by the Midmer-Losh Organ Company. It is the largest organ in the world, as measured by the number of pipes (officially 33,112, but the exact number is unknown). The main auditorium is 487×288×137 feet (148×88×42 m) with a floor area of 140,000 square feet (13,000 m²), giving a volume of 5,500,000 cubic feet (160,000 m³). Consequently, the organ runs on much higher wind pressures than most organs in order to achieve a volume loud enough to fill the hall. The organ has four entries in The Guinness Book of World Records including "Largest pipe organ ever constructed", "Largest musical instrument ever constructed" and "Loudest musical instrument ever constructed", and holds several records in the organ world. It is one of only two organs in the world to have an open 64' rank, and the only organ to have stops voiced on 100" of wind pressure (~ 3.6 psi).