SETUP
JBL
3-32
CALIBRATING SPEAKER DISTANCES & OUTPUT LEVELS
The SDP-40 offers manual calibration of speaker distances and output levels. Calibration helps to ensure accurate output signal arrival time and
level at the primary listening position. However, it is not a substitute for proper speaker placement.
Before calibrating speaker distances and output levels:
•
Set crossover points for the Main Zone audio output connectors.
Otherwise, setting crossover points afterwards might invalidate
calibrated output levels. (The CUSTOM or THX SETUP menu
can be used to set crossover points.)
•
Eliminate extraneous noises in the listening space, including
conversations, air conditioners, and sounds that filter in
through open doors and windows.
•
Remove objects – including people – blocking the line-of-sight
path between the microphones or SPL meter and the speakers.
Speaker Calibration Parameters
The table on the next page indicates the speaker calibration
parameters that can be used to set speaker distances and output
levels for the speakers connected to the corresponding Main Zone
audio output connectors. These parameters are available on the
speaker distance and output level menus shown throughout this
section.
Speaker Distance Parameters
+0.0 to 30.0ft or 12.0m
Determine the distance between the primary listening position and
the speaker connected to the corresponding Main Zone audio
output connector.
Output Level Parameters
-18.0dB to +12.0dB
Determine the output level of signals sent to the speaker connected
to the corresponding Main Zone audio output connector.
UNITS
FEET, METERS
Determines the unit of measurement in which speaker distances
are calculated on ALL speaker distance menus. When FEET is
selected, the SDP-40 calculates speaker distances in feet. When
METERS is selected, the SDP-40 calculates speaker distances in
meters. When the UNITS parameter setting is adjusted, the SDP-40
automatically adjusts speaker distances to the closest available
value in the selected unit of measurement.
UNITS
SPEAKER DISTANCES
MANUAL
SPEAKERS
SETUP
