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Hello!
I’m playing with Breakaway in the following scenario:
Studio Output -> Breakaway Live -> Edcast (encoding stereo MP3 @ 192k) -> Icecast -> the Internet -> VLC -> BBP -> Audigy 2 ZS -> DigitCD -> airwaves
The idea is to replace a rather expensive T1-based STL with a much cheaper IP connection, while avoiding compromising the final sound quality too badly.
Having said all that, how would you configure Live and BBP for optimum performance in this situation? I’m torn on how much and what kind of processing to do on either side of the stream to make things sound their best.
–Keith
I’m using Live for protective limiting before the stream. I always assumed that was important, if not necessary. Is that not the thing to do?
Right now I’m using the Protection Limit preset in Live, and Plutonium in BBP. AFAIK, this would be the normal way of doing things given a more traditional STL setup (I think back to the older Orban setups, which would have a studio chassis for STL protection and a final processor out at the transmitter). But I’m not convinced this is the best way here, seeing as my STL is using a lossy codec.
My thinking is that perhaps I should be doing more of my processing before the stream, so that I can minimize the effects of the codec. (I know they say that AAC+, for instance, should be transparent at 128K or higher – but in this case I tried it and still hear a noticeable difference when comparing input and output.)
Am I looking at this correctly?
–Keith
(edit: more background)
well .. you can always set -10 or -6 attenuation. Now you have 2 processings which is always bad idea.
Next I would change from mp3, to Vorbis.
[quote author=”kthelen”]I’m using Live for protective limiting before the stream. I always assumed that was important, if not necessary. Is that not the thing to do?[/quote]
It won’t provide you ANY additional headroom. At all. Originally the AGC was put before the link because of noise, but now with digital links, that use is gone. But even with analog, it’s never been possible to get more headroom.In other words, if you are running a device (analog or digital) loud enough where the input audio will clip within it, then adding a device before it to prevent that won’t actually add headroom. It’ll only add noise, and the "distortion" of altering the dynamics. (sometimes good or bad, that’s not what i’m discussing now)
The only solution is to give yourself headroom with thoughtful engineering. Give yourself a good 12dB peak of headroom on the inputs, when you’re playing an already maximized CD. Understand what I mean?
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