Quote:
Originally Posted by
thehightenor
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It really is simple.
In a 24 bit system.
Make -18dBFS your "virtual" 0dB and then you have 18db of headroom before digital clipping which sounds likt sh*t (well to me at least)
On my HEDD 192 meter when I'm track I aim for peaks to land at about -18dBFS then during performances when things inevitably warm up and get energetic there's plenty headroom before digital clipping.
But "'virtual' 0dB" means nothing without telling us what you're measuring. Is it peak or RMS? A newbie won't know.
When you say you aim for peaks to land at about -18dBFS you make it sound like you were talking about peaks earlier since you didn't specify RMS (which in turn sounds like the word "pinging"). That's
very different from the RMS most people actually recommend using for measurement when recording, and also different from 'real' "0dB" which in the analog world would be "0dBVU", a measurement of average level and
not of peak.
The "headroom" is there for a reason. In analog the way we think about the headroom beyond "0" on the VU meter is that it's the place where our peaks live. So if you have an instrument where peaks are 16dB higher than RMS then as long as the onset of distortion is beyond +16dBVU you're good. That's what the headroom is there for. Peaks. It isn't there to be not used.
Now, if your analog devices are operating nominally at 0dBVU, then running your gear 18dB lower seems... "less nominal"... This includes the analog front-end of your analog-to-digital converters as well. And in addition to that there's just no way a performer will actually play 18dB louder, comparing a rehearsal when you're setting levels to the actual take you're recording. 18dB is
a lot.
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So my first point is that it's so easy to write out if we're talking about peak or RMS or average or whatever, so why not do it? It avoids confusing the 'newbies' who won't be able to understand which one you're talking about. Someone even started a thread about it not too long ago requesting us all to do just that.
And my second point is that surely we should be aiming for our
average level to be around -18dBFS after conversion,
not peaks.