Audible noise emanating from converter stations can be a significant environmental factor to consider when selecting a location for construction of converter stations. The sources for the audible noise, the magnitude of the noise. Methods for analysis of the noise distribution and published standards to consider are identified in this chapter. Only outdoor audible noise is covered here so the potential health effects of noise to which personnel working inside the buildings are subjected to is not covered here. The differences between noise emanating from HVDC line commutated converters (LCC) and voltage sourced converters (VSC) are described according to the equipment used in each technology. This information should be useful to readers seeking to understand the audible noise issues involved with HVDC converter stations and their operation. It should also assist planners and developers as they seek to understand audible noise issues related to HVDC converter stations, and how to mitigate the noise in a cost-effective way if needed.