User Manual

7
[Rear]
This figure represents the BG-2120.
25 26 27 28242322
2120
12 13 14 15 16 17 18 19
12. Line 3 input terminals
10 kΩ, –10 dB*, unbalanced, removable terminal
block and RCA jacks. (Upper and lower RCA
jacks are internally, passively mixed.)
Connect a sound source equipment such as a
CD player.
13. Line 2 input terminals
10 kΩ, –10 dB*, unbalanced, removable terminal
block and RCA jacks. (Upper and lower RCA
jacks are internally, passively mixed.)
Connect a sound source equipment such as a
CD player.
14.Line 1/TEL input terminal
10 kΩ, –10 dB* (LINE 1)/–20 dB* (TEL)
Electronically-balanced, removable terminal
block. Use the Function switch A (15) to select
either Line 1 or TEL.
Connect a telephone or a sound source
equipment.
15. Function switch A
Used for LINE 1/TEL gain switching, phantom
power ON/OFF settings, and Mute Send mode
settings.
• DIP switch 1
ON: Switches the LINE 1/TEL input gain to
LINE 1 (–10 dB).
OFF: Switches the LINE 1/TEL input gain to
TEL (–20 dB).
• DIP switch 2
Sets ON or OFF depending on whether or not
the microphone connected to the MIC input
requires phantom power.
ON: Supplies phantom power (24 V DC) to
the microphone.
OFF: Turns off the phantom power supply.
• DIP switch 3
Set to ON to place the MIC input in Mute Send
mode (audio signal-activated muting mode).
• DIP switch 4
Set to ON to place the LINE 1 or TEL input in
Mute Send mode (audio signal-activated
muting mode).
• DIP switch 5
Set to ON to place the MODULE input in Mute
Send mode (audio signal-activated muting
mode).
Notes
• Switche 1 is set to the ON position by default.
• Switches 2 – 5 are set to the OFF position by
default.
• Be sure to turn off the power before performing
above settings. Failure to do so may cause the
loud noise to be generated or unit failure.
16. Mute sensitivity control
Adjusts the threshold level for the MIC, LINE
1/TEL, and MODULE inputs to activate the mute
function. Turn clockwise to increase the
threshold level (lower sensitivity), and
counterclockwise to decrease it (higher
sensitivity).
Note
The audio signal level to activate muting is
independent of input volume settings. So, the
Mute Receive input is muted if a signal enters
the MIC, LINE 1/TEL, or MODULE input even
when the input volume is turned down. To avoid
unwanted muting caused by unintentional inputs
such as background noise and noise sound, it is
recommended to cut the audio signal at the input
equipment (such as a microphone with talk
switch).
* 0 dB = 1 V