MACKIE Pro Audio Lab - Manual (Page 16)

User’s Guide
Spectrum Analyzer
Spectrum Analyzer Screen
Select the Spectrum Analyzer from the Analysis drop-down menu. The graphical rep-
resentation indicates the level of an audio signal at various frequencies. The analyzer
performs a Fast-Fourier Transform (FFT) on the input audio to convert it to fre-
quency information. This is put into individual bands and displayed as a bar graph. A
spectrum analyzer designed to indicate the level of audio at 31 different frequencies
across the audio range is also known as a 1/3-octave spectrum analyzer. Up to 61
bands (1/6th octave) are supported in mono mode, and up to 31 bands (1/3rd octave)
are supported in stereo. 10, 15, and 20 bands are also supported.
Range (–96 dB to –30 dB)
The analyzer range enables you to adjust the viewing range of your signal between
–96 dB to –30 dB.
Left/Right Buttons
Select either right or left channel inputs for viewing.
Mono
The mono button enables a mono view.
Stereo
Use to select a stereo view.
Freeze
The freeze button will freeze the current frame to let you take a closer look at your
signal in the spectrum graph.
Peak
When the Peak button is enabled, each band’s meter displays its own peak, present-
ed as a small individual yellow hash mark at the top of each meter. When a band's
peak is reached, a hash mark appears and then gradually decay.
Ref
Reference is a hand reference point represented as a red line on the analyzer graph
that can be set anywhere from –60 dB to 0 dB. Use this to maintain a relativity refer-
ence that most suits your need.
Right
Mono
Stereo
Freeze Peak Reference Precision Left
Range