AC3Filter is a high quality free audio decoder and processor filter. It allows media players to playback movies with AC3 and DTS audio tracks. Also it can process any audio track, much of processing options allows to adjust the sound in almost any way. It is possible to upmix any audio source to 6 channels. Filter can do multi-channel and digital (SPDIF) output. It can encode any audio source to AC3 on-the-fly and send it over SPDIF to the receiver.

Features:

Playback

Watch movies with AC3 and DTS audio tracks

Listen multi-channel (AC3/DTS) AudioCD

Playback WAV files with AC3/DTS content, ripped from multi-channel AudioCD without any conversion of these files.

Playback raw .AC3 and DTS files (with help of AC3File filter)

Process

Up-mix any audio track (even plain stereo) up to 6 channels

Down-mix any audio track to any number of channels (to match your speaker configuration)

If you have an external Dolby ProLogic decoder, you may use ProLogic down-mix to help DPL decoder to extract surround information

Watch movies under poor hearing conditions (noisy environment, weak speakers, ...)

Decrease dynamic range to watch movies at night

Apply time shift to the audio track to synchronize audio with video.

Adjust gain of every input/output channel independently to compensate loudness differences

Adjust time delays for every channel to compensate different distances to loudspeakers.

SPDIF

Passthrough AC3 and DTS over SPDIF without any change to external decoder

Encode any audio to AC3 and transmit it over SPDIF

USB sound cards supported

AC3Filter is freeware. However, if you enjoy using AC3Filter and would like to help support its development, please consider making a donation.