Meridian Audio Digital Surround Controller G61 用户手册

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This section explains how to use the Sine/Sub/Sens controls 
to check for room resonances, adjust the subwoofer crossover 
frequency, or adjust the sensitivity of the analogue sources.
To display the Sine/Sub/Sens controls
• If necessary, unlock the digital surround controller as described in 
• Press  More until the bottom line of the display shows:
Sine/Sub/Sens.
Clear
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Radio Trifield    65
• Press Sine/Sub/Sens.
The bottom line of the display shows the Sine/Sub/Sens controls:
Sine -Xover+
-Sens.+
Radio Trifield    65
   Subwoofer  crossover  frequency
The G61 Digital Surround Controller allows the crossover frequency 
for any subwoofers which you have to be adjusted between 30 and 
150Hz. The crossover can be set independently for Music, Logic, 
and 5.1 Movie layouts. The default is the THX standard of 80Hz.
To adjust the subwoofer crossover frequency
• Select a source, then display the Sine/Sub/Sens controls as 
described above.
• Press  Xovr- or Xovr+ to decrease or increase the crossover 
frequency.
The display shows the current crossover frequency:
Sine -Xover+
-Sens.+
CD    Xover   85Hz
For THX loudspeaker systems you should not adjust these settings; 
they should be left at 80Hz. 80Hz is also the recommended setting 
for all movie listening. You may prefer, however, to lower the 
crossover frequency for music if the main speakers have good bass 
handling down to, say, 50Hz.
 Sinewave  sweep  test
The G61 includes a sinewave signal test, to help you set the 
subwoofer crossover frequencies, or check for room resonances. To 
avoid possible damage to the speakers the volume is reduced to 
50, if necessary, on entering the test.
Warning: This test is very loud. Very loud low-frequency 
signals may damage the speakers.
To use the sinewave sweep test 
• Select a source, then display the Sine/Sub/Sens controls as 
described above.
• Press  Sine to turn on the sinewave signal.
Using the  Sine/Sub/Sens controls