Setup – JBL SYNTHESIS SDP-40HD User Manual

Page 83

SDP-40HD

Setup

3-43

MANUAL CALIBRATION

(continued)

INTERNAL NOISE TEST

Opens the INTERNAL NOISE message shown on the previous page,
which indicates that the internal noise test generates loud
calibration noise signals.

When the INTERNAL NOISE message opens:

•

Press the

arrow button to open the SPEAKER LEVEL ADJUST

menu shown on the previous page. When the SPEAKER LEVEL
ADJUST menu opens, the internal noise test automatically
begins.

•

Press the

button to stop the internal noise test.

During the internal noise test, the SDP-40HD sends calibration
noise signals to each speaker in the order shown on the SPEAKER
LEVEL ADJUST menu. The cursor automatically scrolls through
output level parameters, highlighting each parameter as the
SDP-40HD sends the calibration noise signal to the corresponding
speaker. The calibration noise signal is sent to each speaker for
about 4 seconds.

Note:

When the internal noise test begins, the SDP-40HD automatically sets
the volume level to +0dB. Avoid adjusting the master volume level
while the test is in progress to achieve THX reference levels (75dB).

INTERNAL NOISE TEST LEVELS CALIBRATION MANUAL SPEAKERS SETUP

To manually calibrate output levels during the internal noise test:

1. Set the SPL meter to “C” weighting and “SLOW” response.

2. Press the

arrow button to highlight the desired

output level parameter. Then, quickly press the

button to

select this output level parameter. The horizontal bar graph
shown on the previous page will open on the on-screen display
and automatic scrolling will stop.

Note:

During the internal noise test, it is possible to select an output level
parameter just as the cursor is about to automatically scroll to the
next parameter, causing the SDP-40HD to send the calibration
noise signal to both speakers. If this occurs, reselect the desired
speaker.

3. When the horizontal bar graph opens, press the

button to select the output level that achieves a 75dB SPL
meter reading from the primary listening position.

4. Press

to close the parameter. The internal noise test will

continue and automatic scrolling will resume.

5. Repeat steps 2, 3, and 4 until all desired output levels have

been set.

SPEAKERS

SETUP

LEVELS CALIBRATION

INTERNAL NOISE TEST