The ANI-HDAINSERT4K3 4K30 HDMI Audio Inserter from A-Neuvideo allows an external audio signal to be inserted into your HDMI or DVI (with an optional HDMI to DVI adapter) signal path. The unit allows you to insert analog stereo or multichannel surround sound (via the digital optical input), giving you the flexibility to add your choice of audio to the video while extending your HDMI signal. It also has the added benefit of DCI/UHD 4K and 3D support, allowing full-resolution video and eliminating the need to downscale the image.