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24. ERGO Calibration
Before you start calibrating:
ERGO’s room correction consists of two stages:
a. Measurement and Analysis this technique, aka “Shooting the room” is the procedure we will follow the
procedure to gain what is known as “Room Knowledge” and is the information required to perform
correction.
b. Calculating, Applying and Storing this is where the correction required is first calculated based on the
Room Knowledge, then applies to the selected monitors and stored within ERGO
ERGO relies on a new way of measuring the room. Using traditional test signals such as pink noise normally means a
trade-off between signal-to noise ratio (SNR) and frequency resolution. Long analysis windows lead to high
frequency resolution but poor SNR due to the low number of averages. But using multiple pure tones means long
analysis windows (5.5 seconds for low frequency test signal) leading to both high frequency resolution (0.2 Hz) AND
an excellent SNR due to very narrow analysis bandwidth in the frequency domain, something which is almost
insensitive to normal broadband background noise. ERGO generates energy at the very same frequencies where the
analysis takes place, that is energy and processing is not wasted by measuring the spaces in between the analysis
frequencies. Because traditional 1/3 octave measurement and correction (three frequencies for each doubling of
frequency) is not sufficient for room correction ERGO will perform improved and more accurate correction.
The measurement at the listening position holds information about the operators access to the sound-field while the
room positions hold information about the 3 dimensional sound-field in the entire listening room. This allows ERGO
to apply the required correction for the operator in the “sweet spot” (FOCUS MODE), or for the entire room (GLOBAL
MODE)
In a new ERGO installation, the software guides you through the set up sequence, indicates when to move the
microphone, monitors the quality of the measurements, and continues the process until the necessary information is
retrieved and the filters for “global” and “focused” correction can be calculated.
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