PRESONUS AudioBox Stereo Quick Start Manual page 258

9.4.1 Peak Meters
Peak meters measure the instantaneous audio level from moment to moment at a very fast
resolution and display the highest output level at any instant. These meters help ascertain the
relationship between a given audio level and other audio levels in the mix. Many effects plug-
ins feature peak meters at the input and output so that any level attenuation the effect
imparts on the audio signal can be seen.
[Right]/[Control]-click on a peak meter to adjust its VU Hold and Hold Length settings.
The peak meters in Studio One will automatically be mono or stereo depending on the audio
source.
9.4.2 Peak/RMS Meters
The Main Out and Sub Out channels feature Peak/RMS meters, which simultaneously show
both peak and RMS levels. Whereas a peak meter will show the highest output level at any
instant, an RMS meter will show an average of the peaks and troughs of an audio signal over
time. An RMS meter is intended to indicate the perceived loudness of the audio being
measured by functioning in a way similar to the human ear and is therefore often used as a
true measure of effective loudness.
9.4.3 Main Out Clip Counter
The Main Out channel features a Clip Counter above its Peak/RMS meter.
The counter will turn red when the Main Out signal clips, and it will count the total
number of clips that occur. Use the counter to help prevent clipping the final
stereo mix of your Song. The counter will reset when clicked or when the Main Out
fader is adjusted.
9.4.4 K-System Metering
The Peak/RMS meters in Studio One also feature K-System metering options. The K-System is
an integrated metering system tied to monitoring gain, and it is intended to standardize the
levels at which sound is mixed and mastered. This metering system features three different
meter scales called K-20, K-14, and K-12. These three scales are meant to be used with different
types of audio production and have been described by K-System inventor Bob Katz in his
Audio Engineering Society technical paper
and Leveling Practices." Katz wrote:
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"An Integrated Approach to Metering, Monitoring,