Having read through the latest Nat-Geo spec for 5.1 delivery before starting a major series, I was glad to see that the 5.1 mix was given more headroom, being able to go up to -2 truepeak. Now try and convince the director that louder isn't always better -) Seriously, put a really good limiter on the stereo mix and doublecheck the loud parts when you're done with the 5.1. This way, no one limiter is doing too much work." To achieve the spec here in house, we generally limit our 5.1 stems to -10dbfs so that a stereo downmix will peak close to -10 dbfs. Keeping the average level the same between the 5.1 mix and the stereo mix allows other regions use the stereo mix as a SAP option without a noticeable change in volume. Having a -10 dbfs peak on the stereo mixes is important for our regions that still broadcast the stereo mix as an analog signal. While the NGC spec allows for 5.1 stem peaks to -2dbfs, a -23 db LKFS 5.1 mix that peaks at -2 dbfs will be well over the -10 dbfs peak requirement for the stereo mix when downmixed. This necessitates a blending of the old analog specs and the current digital standards. Because our 5.1 and stereo mixes are used in different ways around the world, we need them to meet certain specs to please all of our regions at the same time. "The level question is a little more complicated. My question was, if I actually used the headroom to -2 truepeak on the full mix, it would be very hard to ALSO get a decent sounding stereo mixdown. I discussed this with a very nice guy at NatGeo's QC Washington.
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