That hasn't been the case with us. There has always been a significant variance in dynamic range between ATV and the rest of the devices. If anything, its worse now.
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I would tend to agree its the source. The bizarre thing is the previews don't have a dynamic range issue. Its like they've added some sort of compression to the files themselves.
Then why would Netflix have the same issue? The very same material played using my TV's Netflix app is much more dynamic. The only commonality between itunes movies and Netflix are they're both decoded by ATV and then the PCM sent to the receiver. Whereas the TV sends the raw stream to the receiver for decoding.