Abstract
In the last decade, new functions for the Public Address (PA) system have been continuously developed and integrated. On the other hand, the existing PA systems are being less repairable and maintainable due to lack of supply of old version components although the system and loudspeakers are still functioning well within the specifications after many years of use. It appears to be sensible way to reinstall the control and amplification system without replacing existing loudspeakers in order to accommodate the new function and zoning requirements. This approach is being tested in Lantau and Airport Railway (LAR) line in Hong Kong operated since 1998. This paper presents the pros and cons using this reinstallation approach in practice and investigates the feasibility and effectiveness through acoustic simulation and on-site verification test of sound coverage and speech intelligibility.
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