AC3 Filter vs LAV Audio: The Old Fix and the Modern One

Two well-known fixes for AC3 and DTS audio, but they are not from the same era. Here's the short version of which one to install today.

Split-screen comparison of the older AC3 Filter equalizer and the modern LAV Audio decoder for AC3 and DTS sound.

If you have been hunting for a way to get AC3 or DTS sound working on Windows, you have probably run into both these names.

They both decode the same kind of audio, so it's fair to wonder which one you should actually grab.

Here's the honest answer up front: for almost everyone, the right choice is LAV Audio.

AC3 Filter still has its fans, but it stopped being updated in 2013, and it solves a much narrower set of problems than it used to.

The 10-second verdict

Just want your sound back? Install LAV Audio. Only reach for AC3 Filter if you are a home-theater tinkerer who wants its old-school equalizer and per-channel controls, and you don't mind running software that hasn't changed in over a decade.

What each one actually is

LAV Audio is the modern, actively maintained decoder. It is part of the LAV Filters project and handles essentially every audio format you'll meet today: AC3, DTS, DTS-HD, TrueHD, Dolby Atmos, AAC, FLAC, Opus, E-AC3 and more.

AC3 Filter is the older tool. For years it was the go-to fix for AC3 and DTS sound, which is why it's still mentioned in so many forum posts. Its last release was version 2.6b back in April 2013, and there have been no updates or fixes since.

Where the modern one wins

LAV Audio supports newer formats that simply didn't exist when AC3 Filter was last touched, like TrueHD and DTS-HD Master Audio. If you watch Blu-ray rips or modern MKV files, this matters a lot.

It also stays compatible with current Windows versions and gets ongoing fixes. And it slots cleanly into any DirectShow player, so Windows Media Player, MPC-HC and others pick it up automatically once it's installed. No format left behind, no decade-old surprises.

Where the old one still earns its keep

AC3 Filter isn't useless. It kept a set of advanced audio-processing controls that the streamlined modern decoders don't fully replicate.

The standout features are its detailed per-channel equalizer and its dynamic range compression, which flattens loud explosions and quiet whispers into a comfortable range.

That second one is a genuine favorite for late-night viewing in an apartment where you don't want to wake the neighbors. If those specific knobs are what you're after, AC3 Filter still does them well.

One caution: because AC3 Filter has had no security updates since 2013, it's best kept to offline media playback rather than anything internet-facing. Always grab it from the AC3 Filter download page to avoid fake copies.

The easiest way to get LAV Audio

If you've landed here because your sound broke after a Windows update, there's a small detail worth knowing. The Windows 11 24H2 update removed the built-in AC-3 decoder, which left a lot of people with silent video and no error message at all.

The quickest fix is the X Audio Codec Pack. It installs LAV Audio in one click without touching your video setup, so it's ideal when only your audio is broken.

If you'd rather have video and audio covered together, the K-Lite Codec Pack bundles the same LAV Audio decoder alongside a full set of video codecs and a media player.

So, which one?

Pick LAV Audio. It's the modern, maintained decoder, it covers every current format, and the X Audio Codec Pack gets it onto your system in under a minute.