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GBC DCB-120BC Quick Start Manual page 2

Public address power amplifier

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5. MIC 5/AUX 2 VOL
This control determines the proportion of the MIC 5/AUX 2 channel signal in the mix, and provides a visual
indication of channel vol.
6. AUX 3/MP3 VOL
This control determines the proportion of the AUX 3/MP3 channel signal in the mix, and provides a visual
indication of channel vol.
7. TREBLE CONTROL
Turn this knob clockwise to boost high frequency. The control has a shelving response giving 15dB of boost
or cut at 10kHz.
8. BASS CONTROL
Turn this knob clockwise to boost low frequency. The control has a shelving response giving 15dB of boost or
cut at 100Hz.
9. LEVEL VOL
Turn this knob to adjusts the final level of the Main output.
10. THE LED INDICATOR FOR POWER, FAULT, PEAK, SIGNAL AND LEVEL
When the power switch is turned on, the POWER LED will be illumed, so the user may be aware of it.
When the FAULT LED is illumed, means the device is damaged, so you must stop using it.
The PEAK indicator circuit monitors the output signal level. When it illuminates, means that the gain or EQ
boost should be reduced.
The signal LED lights when the output signal level reaches approximately -30dBu.
10-segment LED METER monitors output signal level.
11. POWER SWITCH
Depressing the power switch supplies power to the power amplifier.
12. ZONE CONTROL
They are 6 rotatable band switches, to adjust 6 zone volumes in 5 steps.
13. MP3 PLAYER WITH BLUE TOOTH
(1) The SD card connector.
(2) Mode: Press this key and release, change the source to USB, SD or Blue tooth.
(3) Play/Pause: In playing state, press this key to pause playing, press it again to recover playing.
(4) Folder/Record: Press this key and release, enter the menu; press it and hold it, enter recording state.
(5) Cycle mode: Press this key to change cycle mode.
(6) Prev-/
: Press this key and release, jump to the previous song and play; push this button and hold it, enter
the rewind state.
(7) Next/
: Press this button and release, jump to the next song and play; push this button and hold it, enter
the fast forward state.
(8) The USB connector.
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