LG BH6730S Owner's Manual

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System Setting
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Speaker Setup
To obtain the best possible sound, use the speaker 
setup display to specify the volume of the speakers 
you have connected and their distance from your 
listening position. Use the test to adjust the volume 
of the speakers to the same level.
[Speaker]
Select a speaker that you want to adjust.
[Volume]
Adjust the output level of each speaker. 
[Distance]
Adjust the distance between each speaker and 
the listening position.
[Test/ Stop test tone]
The speakers will emit a test tone. 
[OK]
Confirms the setting.
HD AV Sync
Sometimes Digital TV encounters a delay between 
picture and sound. If this happens you can 
compensate by setting a delay on the sound so 
that it effectively ‘waits’ for the picture to arrive: 
this is called HD AV Sync. Use A D to scroll up and 
down through the delay amount, which you can 
set at anything between 0 and 300 ms.