Dolby Digital Logo's should opnly be played before and if the feature is indeed in Dolby Digital. These are intended to announce the film is in Digital not that the theatre has Digital capability.
In the same way you only run a DTS or SDDS title before and if the film is being played in either of those formats.

THX logos are there to announce you are in a THX cinema. it does not imply Digital / SR / DTS or SDDS just that the cinema you are sitting in is THX certified, you could follow it with the relevent logo if you wanted to.

At no time have I suggested that trailers should be run too loud... just that the level is realistic and not turned down below that level as is implied in some of the replies. Adverts and Trailers are an important part of the 'Show' and an important source of revenue. They all deserve to be played equally...... in my opinion!

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On the other hand, many theaters are not properly equipped to play digital sound. In the discussion you started about clipping, I wrote a post about dynamic compression and distortion which deals with the subject. I wonder if anyone has read it because it is quite long and theoretical...

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A good one would be one that either a) the audience doesn't notice, because it sounds almost identical to the last thing they heard, or b) the audience does notice, because it sounds BETTER (not necessarily louder) than the last thing they heard.

A bad one would be one that sounds WORSE than the last thing heard, AND it's an unexpected transition. In other words, if you're going to see Gone With The Wind, and the movie sounds worse than the LOTR trailer in front of it, that's ok because it should be an expected transition into the lower sound quality that goes with movies of that era. But, if you're going to see The Four Feathers, and THAT sounds worse than the LOTR trailer in front of it, that is unexpected and therefor a BAD switch.

Frankly, I don't think there is anything wrong with such a transition if the feature in question is more subdued simply because that's the kind of film it is. People aren't stupid; they have different expectations from a big adventure film than they do a thoughtful drama. If for whatever reason the LOTR trailer runs just ahead of Gossford Park people understand the differences. I think your concerns are more valid when you have the big digital sound trailer ahead of a similar type of film which either doesn't have digital sound (rare) or only has a brand you don't have on that screen. I would still want the customer to hear how the upcoming film is going to play at this theatre should they choose to view it here--and protect from a jarring transition via the snipe or intervening trailer.

Yup, that's what I said, or tried to say. I think we can agree that beyond that, it appears to be a matter of taste and personal beliefs. But it always helps to understand why people do things the way they do them, and this topic has pointed out a clear split right down the middle of the participants, which is pretty interesting.