DSPPA is China public address system manufacturer since 1988, provide 600 models of PA devices including PA system, speaker, amplifier, home central audio equipment and conference system. We have power and stereo amplifiers for universities, schools and communities. Our PA system and digital conference system are applied in outdoors plazas, gymnasiums and office buildings. We develop intelligent and LAN controlled PA system for Expo 2010 Shanghai. We have microphone, signal matrix, indirect speaker selector, digital recorder and lightning conductor for public address devices. Quality warranty is available for audio products, welcome.