... and paging for various vessels,ports, platforms,etc. HKD PA system is used for commanding, communication, talk-back, G/A and ... ports, platforms and other projects.The type E public address main unit with dual amplifier powered from main power and emergency supply. It ... 535~1606KHz;FM 87~108MHzPRODUCT LIST OUTLINE AND MOUNTING DIMENSION Public address system amplifier, power amplifier