Re: [LAU] -3.0 dB

On Mon, Sep 21, 2009 at 06:19:51PM -0700, carmen wrote: They could sum to anything between -inf and +3dB, depending on how related they are. And even for decorrelated signals, where RMS of the sum will 3dB higher than each channel separately, the peak level will increase by more than 3dB, up to 6dB. What is the 'correct' level for any recording depends on the type of music, the context, where and how the recording is going to be used, etc. If you are participating in the loudness war (see http://en.wikipedia.org/wiki/Loudness_war) you will try to squueze out the last fraction of a dB. Usually with disastrous effect on the quality of the sound or music, even if it does not clip or distort. If you go for a more musically enjoyable result it depends very much on the type of music. For anything 'heavy' you'd want to maximise the loudness without clipping. In that case a fast peak limiter at -1dB or so will do wonders without affecting the sound too much. For anything classical or when you want to preserve the natural dynamics of real instruments and performers. peak levels are less of an issue, and your decisions on level should be based on what your ears tell you, and be guided by a meter that does indicate both RMS and peak. Ardour's meters are near to useless for this, jkmeter will do a good job if you learn to use it. Ciao, -- FA Io lo dico sempre: l'Italia è troppo stretta e lunga.