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AC3 Sound Level Issues

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Matthew Rundell
AC3 Sound Level Issues
on Oct 5, 2011 at 6:13:26 am

For years the same problem and I don't have a solution. The AC3 that must be made to make a DVD always sounds about 8 db too low. When I raise the db within Compressor, the AC3 sounds bad, a lot of gain ups and downs, either it's that or it is very sensitive to my mixing modulations. The aif sounds great, so this is something wrong in the AC3 compression. Any solutions when having to compress an AC3? I can't just use the aiff on the DVD, not enough room.

Matt Rundell


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Michael Gissing
Re: AC3 Sound Level Issues
on Oct 5, 2011 at 9:18:39 am

Don't change the mix levels. In the ac3 encode tabs in Compressor, set dialog normalise to -31db and turn film compression off (select none).

Levels should now be close to the aifs. ac3 will flatten things a bit but with those settings, you are effectively turning the Dolby chip off so it doesn't alter levels or mix dynamic which it does badly.


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Joe Barta IV
Re: AC3 Sound Level Issues
on Oct 5, 2011 at 12:55:58 pm

Wow, I always thought the low db was a characteristic of the AC3 format. I've never heard anyone mention that it could be corrected. Thanks for the great tip MG!

Bars & Tone
SALUTE!


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Chris Borjis
Re: AC3 Sound Level Issues
on Oct 5, 2011 at 4:18:24 pm

What Michael Said.



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Matthew Rundell
Re: AC3 Sound Level Issues
on Oct 5, 2011 at 4:24:41 pm

Thanks so much! That did the trick. Really appreciate the help!

Matt Rundell


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