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It would be great to have a preset for BAL that works like a leveler (like the Ariane/8200ST/whatever). BAL could be used on the studio-end of a STL while BBP runs with the AGC disabled at the transmitter-end. With the present versions, is there a way to do this?
If you look at it from the perspective of the *fact* that somewhere before your AGC you will have a headroom limitation, and that you will need to not go over it, then really it doesn’t matter where your AGC is at because it’s not going to provide any additional protection against "overs" above that headroom.
What really should be done is to set a point where you will have enough headroom to not worry about it, and *calibrate* your whole system to it.
EBU’s R128, and the Loudness Unit in general, is a wonderful way to do that which is already in line with accepted practice while using LKFS (ITU-R BS.1770) for a production environment. There are already several R128-compliant meters out there (there is probably a free one by now, i haven’t been watching closely), and you can somewhat align most un-weighted RMS meters in a mixer to be pretty close to the same readings, so that 0dB RMS on the mixer is aligned with 0 LU in the rest of your calibrated system. That’ll give you 23dB of peak headroom above that point. More than enough room before your board starts to become non-linear (aka distort).
an example of one
http://www.nugenaudio.com/visLM_loudnes … U_RTAS.phpThe awesome thing about Loudness Units is they are on average within 0.4dB (or maybe slightly less) of actual perceptive loudness to the average person. To put that into perspective, un-weighted un-gated RMS can be more than 6dB off actual perceptive loudness. 😆
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