The C2G HDMI Audio De-Embedder will split the audio off the HDMI bus and convert it to Toslink, S/PDIF, or a 3.5mm connection. This device will allow for the audio to continue to the television or monitor to use the audio at the display side as well This device is specifically useful for projector installations that want to use an amplifier as the audio source. Most projectors do not have an audio output from the HDMI connection, so this HDMI Audio De-Embedder will allow the audio to be extracted from the device to connect to the amplifier Please note: Digital signals such as Dolby Digital and DTS audio from the source device are supported through the Toslink and RCA ports. The 3.5mm port supports PCM audio signals from the source device. The source device must be set to a PCM audio mode to use the 3.5mm audio output.