User guide

24
Measurement
Before Measurements
Review the following guidelines:
1 Some subwoofers have a standby mode. Be sure to turn this
function off before measuring (see Before the MultEQ Pro
Calibration, page 17)
2 The microphone should be placed in a vertical position (grazing
incidence) for all measurements.
3 Connect the mini-XLR cable from the microphone preamp LINE
OUT to the 1/Mic input of the Sound Equalizer using the mini-XLR-
to-RCA Adapter
4 Quiet the room as much as possible. Background noise can disrupt
the room measurements. Close windows, silence cell phones,
televisions, radios, air conditioners, fluorescent lights, home
appliances, light dimmers, or other devices.
5 Refrain from talking during measurements. Do not sit or stand
directly between any of the speakers and the microphone during
the room measurements. Each speaker emits a series of test
signals during the measurements. Obstacles between speakers
and the microphone, and background noise can disrupt the
microphone’s ability to record the room response to the test signals.
Before Measurements:
The microphone should
be positioned as far out
from the stand as possible
to minimize the effect of
stand reflections. The
microphone has been
calibrated at grazing
incidence and should
point to the ceiling.
Incorrect
Correct
The room measurement
process plays a series of
full-bandwidth test signals
through each channel to
measure the room’s
response. Audyssey has
designed the test signals so
that several thousand
measurement samples are
collected.
During room measurement,
some channels may repeat
the series of test signals at
a louder volume. This is
done to overcome
background noise problems
and achieve the required
signal-to-noise ratio for
creating precise room
correction filters. The level
trim calculation is not
influenced by the increase
in test signal level.