AC3Filter is a high quality free DirectShow filter designed for real time audio decoding and processing. It has a priority on wide functionality and convenient settings. Filter can decode following audio formats: AC3/DTS/MPEG Audio. It also supports multi-channel and digital (SPDIF) outputs. What's new:

Now filter saves output settings to preset. So now you can create presets with different output configurations. Tray icon and some other options display fixed Fixed crash with TMPGEnc

Download: AC3 Filter 1.11