Originally Posted by tbaucom
The test tones on the avia disk are recorded at -20 dBF. It is supposed to measure at 85 dbl on the SPL meter when at reference level. I'm sorry if I wasn't clear about this in my original post.
I have seen other test discs, like the Goldline Audio Toolkit, where the encoded signals used the default dialnorm setting of the DD encoder. That will unfortunately attenuate the levels by 4 dB (as others already mentioned). I think the rationale for that was since DD movies are playing back 4 dB low due to dialnorm, the test tone should as well, thus accurately calibrating the volume control. But the days where most movies are encoded with Dolby Digital are long gone, and most BDs do not apply a gain reduction. So it's a bit of a mixed bag when it comes to knowing exactly what reference level is supposed to be unless your AVR can display the encoded dialnorm value, as do the Anthem units.
If you want a snippet of a known signal, this link
will download a zip file I posted in another AVS thread. It is an MP3 file, 5 seconds of "THX style" bandlimited pink noise, then 5 seconds of sine wave, both at -30 dBFS. Unzip it and play it from a USB or however you play MP3 files -- turn on looped playback if you want it to repeat. It is stereo format with only the L channel having signal. The noise section should produce 75 dB SPL.
Originally Posted by Tomas2
Yes i believe that wording is somewhat misleading, their dynamic range management (dynamic compression) system works in concert with the encoded dialnorm setting to limit the reproduced dynamic range.
That’s due to the fact dialnorm represents the level of compression used in the production process. It’s my understanding that this feature cannot be disabled in the decoder.
While it is true that the DRC gain cut and boost values embedded by the DD encoder are determined relative to the dialnorm value of the soundtrack (so as to leave signals in the range of the dialnorm level untouched), the dialnorm value itself represents nothing other than the long term loudness value of the program. It is a fixed value for the entire duration.
It is also correct that the normalization process of Dolby decoders cannot be turned off. DRC of course, can.
I also seem to remember Avia unfortunately used Dolby’s default setting.
That appears to be the case, but probably with good intentions. All that was needed was to inform the users how the signal was encoded. The newer Spears & Munsil Second Edition BD is a model of perfection in that regard. But unless you need all the video tests, it's a lot to pay for some audio test tones.
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