SPA 1500 The SPA-1500 system is a standard marine Small Public Address system, especially designed to cover the need for PA and entertainment distribution onboard small and medium size vessels. This system has a very compact design, but comprises much of the functionality of larger systems. The customers may choose between many additional functions/facilities, and thus obtain an almost tailor-made PA system. • Self supporting rack modules, outer cabinet available. • Extremely compact design. • Up to 3 zones selectable in any configuration. • Up to 3 microphone units, full facility.