Question about Dolby. - AVS Forum | Home Theater Discussions And Reviews
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post #1 of 10 Old 03-16-2013, 12:07 AM - Thread Starter
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I was playing Batman The Dark Knight Rises Blu-Ray and had Dolby turned on, on my Anthem MRX AVR.

During the scene with The Bat flying out of the side of the buildings when the deep bass buffeting sound from the aircraft was playing I noticed the sound sounded...well...pretty bad. The general volume seemed turned way down, and the speech was hard to hear (currently just using a 2.1 system).

I figured it's probably Dolby trying to narrow the dynamic range causing this effect so I turned Dolby off and the problem went away.

Is this typical?
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post #2 of 10 Old 03-16-2013, 07:56 AM
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Dolby is not something you can turn on and off. It's a data compression codec. If the source is encoded using Dolby, you must use a Dolby decoder in order to get any sound. So, what do you mean when you say you turned Dolby off?
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post #3 of 10 Old 03-16-2013, 08:51 AM - Thread Starter
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There are settings on the receiver to turn Dolby volume on or off and various Dolby settings when on.
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post #4 of 10 Old 03-16-2013, 09:11 AM
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Dolby Volume is a volume leveling feature, so it's no surprise that a dynamic movie will sound better with it turned OFF.

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post #5 of 10 Old 03-16-2013, 09:15 AM
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Ah, Dolby Volume. That's a feature designed to even out program levels, an improved version of Dynamic Range Control and dialog normalization. But, it doesn't always work in ways that are pleasing to everyone in every possible configuration of playback equipment and room acoustics.
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post #6 of 10 Old 03-16-2013, 11:30 AM - Thread Starter
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Ok looks like that's going to be turned off permanently. Can't wait to get a center channel.
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post #7 of 10 Old 03-16-2013, 09:29 PM
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I have two related questions about DRC in Dolby encoded audio and Dolby Volme in AVRs.

What's the difference?

If you engage Dolby Volume (which i understand works for all signal formats, not just Dolby tracks) on a Dolby track (TrueHD or DD), does it just use the DRC in the track, or does it ignore it and applies Dolby Volume instead?

Audiosceptics accept audio trials using 25 people. A recent Oxford study with over 353,000 patient records from 639 separate clinical trials shows for every 1,000 people taking diclofenac or ibuprofen there would be 3 additional heart attacks, 4 more cases of heart failure and 1 death every year.

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post #8 of 10 Old 03-16-2013, 11:14 PM
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Here's a thread with a bit of discussion about Dolby Volume and DRC, including comments from Roger Dressler, the former manager of product development at Dolby. It's short, but may be a start.

http://www.avsforum.com/t/1338213/is-dolby-volume-really-the-best-solution
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post #9 of 10 Old 03-17-2013, 05:23 AM
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Run DV with the Modeler only if your AVR allows. Sometimes the setting is labeled "low" or "modeler only"
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post #10 of 10 Old 03-18-2013, 01:24 AM
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Thanks BI, interesting comment in the last post of the link... smile.gif

Audiosceptics accept audio trials using 25 people. A recent Oxford study with over 353,000 patient records from 639 separate clinical trials shows for every 1,000 people taking diclofenac or ibuprofen there would be 3 additional heart attacks, 4 more cases of heart failure and 1 death every year.

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