I'll post the full description later -- I need to translate the text to English.
Originally Posted by FilmMixer
Did you verify the differences using test tones?
What are these strict requirements you speak of?
Levels on the individual channels were matched between the two processor using an 8-channel PCM audio clip. I was using 1kHz for the full channels and 40Hz for the LFEs. The levels were matched with a VU-meter on the balanced XLR output from the processor.
Most media content, like stereo and many multi channel sources, yields no volume difference between Marantz and Yamaha, proving that the level calibration is correct.
I am currently pursuing a trail where it could seem like the Marantz had dynamic compression set to its default values, which is on for Dolby TrueHD. The art of flight does have the dynamic compression meta-data set in its stream, so that is a plausible hypothesis.
By strict requirements I mean that when playing back a Dolby encoded track (or DTS for that matter), the relative levels between the channels shall be equal. A TrueHD track must reproduce exactly equal on all variants of decoder, brand and models. Otherwise the product would not pass the product tests by Dolby licensing.
Specifically in this example, the center channel shall have the same relative volume to L and R on all variants of decoders, make and models. Marantz 8801 and Yamaha CX-A5100 evidently behaves differently, and I think it's likely that the cause is dynamic compression being wrongfully enabled (which it seems to be by default) on the Marantz.