TrueHD vs. TrueHD - Is All TrueHD Created Equal?

[Slec]

Ascended... I've dug through some of the stuff Sir Terrence has posted on in his Insider thread (may be a good place for your question as well). here's my bastardization of some possibilities

Not all sound effects are recorded in 48/24. So if some is 48/24 and others are 48/16, it may be part of the issue and they will vary from movie to movie.

This one backs up what Wicky was saying and why its a bit difficult to compare tracks and peaks: Link

Since the bitrate would be variable from moment to moment, this is an impossible question to answer. With variable bitrate codecs the bitrate is determined squarely on how many bits it takes to represent the signal tranparently from second to second. The more demanding a soundtrack is, the more bits required. In the absence of sound effects and music, and with just dialog the bitrate drops substantially. This is unlike the lossy DD and Dts which use a constant bitrate and code and allocate what bits are available in that steady pool.

my emphasis is bolded.

Put those two together and it could be a reason. I'm not discounted the HD DVD theory... that's why it may be a better question for an insider.