Yamaha DDP-10 - Manual (Page 22)

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4. When “TEST CENTER ···dB” is shown on the display, adjust the
level of test tone from the center speaker by pressing the
PARAMETER + or – button so that it becomes almost as same as
that of the main speakers.
* While adjusting, the test-tone is fixed on the selected speaker.
* Pressing “+” increases and “–” decreases the value.
Pressing and holding the button will change the value
continuously.
5. In the same way, when “TEST R SUR. ···dB” is shown on the
display, adjust the level of test tone from the right surround speaker
so that it becomes almost as same as that of the main speakers.
6. In the same way, adjust the level of test tone from the left
surround speaker.
7. When adjustments are finished, press the TEST switch once
again.
NOTE: Once you have completed these adjustments, use only the
master VOLUME control of the amplifier (or receiver) to adjust the
whole listening volume. Do not change any other volume setting in
the system.
PARAMETER
DSP T DVD/LD P
Adjustable