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Why is audio playback -5db down from "pure" players such as Adobe Audition?

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mattkhan:
I think @Matt would have to explain exactly how 5.1 is upmixed to 7.1 however how do you think it should be upmixed? simply clone them? something else?


--- Quote from: MarcVRML on April 29, 2023, 01:31:57 pm ---However, whilst this sounds terrific, it completely removes all the benefits for my other 2-channel music of the JRSS mixing, which does an awesome job of upmixing to 7.1 (which is the native number of channels I operate on my Windows system).

--- End quote ---
you can always use zoneswitch to apply DSP differently to different mixes

MarcVRML:
That's a really good point - I've just tested after setting the Channels to 5.1 with JRSS both enabled and disabled, and in both cases volume and dynamics were great. As soon as I switched to 7.1, that's when the 5db attenuation occurred.

It's like there's a deliberate overhead in the upmixer which drops the audio levels.

Best,

Marc

mattkhan:

--- Quote from: MarcVRML on April 29, 2023, 03:34:36 pm ---It's like there's a deliberate overhead in the upmixer which drops the audio levels.

--- End quote ---
from what I can see, JRSS 5.1->7.1 knocks RL/RR down by 3dB and then puts something (a copy of RL/RR?) in SL/SR about 9dB further down. LRC and SW are untouched. This doesn't seem like it would account for a 5dB drop overall, I think it could change the surrounds quite a bit though depending on your layout.

MarcVRML:
I'm measuring the 5db drop on L/C/R, which is what makes it so noticeable.

MarcVRML:
If anyone's monitoring this for answers, I have some more info (and I'm kicking myself it's this obvious).

It turns out that although my system is natively 7.1, when activating Dolby Access for Atmos audio, it applies 5.1.4 instead of 7.1.4. This may just be a glitch on my system, but it seems that the loss of the additional 5db I measured is as a result of those extra 2 channels going missing. Once I drop the output format to 5.1 instead of 7.1, full audio volume returns on all content, regardless of whether I use JRSS upmixing or not.

Thanks to everyone who tried to assist.

Best,

Marc

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