An HDMI audio splitter is a device that allows you to send audio signals from a single HDMI source to multiple output devices. This is useful when you want to connect one HDMI source, like a Blu-ray player or gaming console, to several audio systems, such as speakers or soundbars, without losing sound quality. Typically, an HDMI audio splitter has one input port for the source and multiple output ports for the audio devices. It ensures that the audio signal is transmitted clearly and efficiently, making it easier to enjoy high-quality sound in different locations or setups.