PreSonus StudioLive AI Series - Manual (Page 37)

4 Universal Control-AI and VSL-AI
4.7 Enabling Smaart Analysis (GEQ and PEQ)
StudioLive ™ AI Software Library
Reference Manual
33
4.7.2 RTA
Clicking on the RTA button (from the Fat Channel EQ or GEQ tab) will launch
a real-time analyzer in which x = frequency and y = amplitude. An RTA
provides a close visual representation of what you are hearing. It provides
a view of the long-term spectrum of the signal—for example, the one-
third-octave spectrum long-term average of a musical performance.
Averaging
While the RTA is engaged, you can adjust its averaging speed. When using music in
test measurements, it is often necessary to average the data over a brief amount of
time. This is because most musical signals do not have energy at all frequencies all of
the time.
Averaging is a mathematical process that takes multiple data samples and performs
division to acquire a statistically more accurate calculation of the response. That’s a
technical way of saying that it slows down the “real-time” of a real-time analyzer.
4.7.3 Using the Smaart Spectrograph to Ring Out Monitors
The spectrograph shows frequency data over time, so a constant frequency,
such as feedback, results in a straight line in the spectrograph. Feedback is
short term for a feedback loop, where a portion of the signal from the speaker
returns to the microphone, resulting in a constant tone at the offending
frequency. “Ringing out” is a process of attenuating the frequencies that are
feeding back to maximize gain before feedback in your floor monitors.
1. With the mic input gain at an appropriate level, bring the aux-
send level up on the mic channel you wish to ring.
Power User Tip: If you are using one console for stage monitors and another
console for front-of-house, set the mic input gain on the front-of-house
console. Do not “gain up” the mic signal on the monitor mixer for the sake
of getting more volume out of a stage monitor, as you can do that in other
places (Mix level for individual channels, Aux Out level for global control, etc.).
Gain staging is very important in order to have a feedback-free show.
2. Click on the GEQ tab in VSL-AI and select the graphic EQ assigned
to the aux output of the stage monitor you are ringing out.
3. Enable the spectrograph.