d&b D12 Hardware - Manual (Page 12)

4. Controls and indicators
D12
LEVEL
PUSH MENU
MUTE
POWER
A B
ON
OFF
OVL GR ISP OVL GR ISP
[1] [3] [2] [4] [5][6][7]
Fig. 4: D12 Controls and indicators
4.1. Controls
4.1.1. Mains power switch [1]
POWER
ON
OFF
[1]
Fig. 5: D12 Mains power switch
The on/off rotary switch is located on the right hand side at the bottom
of the front panel.
- OFF: the D12 is isolated from the mains power supply except the
overvoltage protection circuit. The power consumption is very low (2
W typical).
- ON: the D12 is switched on. Via remote or the MUTE A or B switch
the D12 can be switched to standby mode. To indicate standby mode
the display remains active.
Note: The mains power rotary switch is a "Brake-before-make contacts" type.
Due to this characteristic the D12 will immediately be switched off by
leaving the "ON" position.
4.1.2. MUTE switch (A/B) (green LED) [2]
D12
LEVEL PUSH MENU
MUTE A B
OVL GR ISP OVL GR ISP
[3] [2]
Fig. 6: D12 Controls
When the mains power switch is set to the on position, the MUTE switch
can be used to mute the respective amplifier channel or place the D12
in standby mode using the MUTE A or B switch. The switch incorporates
a green LED indicator which indicates three different states - ON
(unmute)/MUTE and STANDBY.
- LED on: ON (unmuted): the D12 is ready for use. A brief press
of the MUTE (A or B) switch will mute the corresponding channel A or
B. A longer press (approx. 1 sec.) of MUTE A or B places the D12 in
standby mode.
- LED regular flashing (1:1 duty cycle): ⇒ ⇒ ⇒ ⇒ MUTE:
the corresponding channel of the D12 is muted however the power
amplifier remains powered but receives no signal from the controller.
A connected loudspeaker is therefore still damped.
The channel is unmuted by briefly pressing the corresponding MUTE
switch.
Note: The setting of the MUTE A/B switch is stored in the D12 when the mains
power is turned off or disconnected. After switching on or reconnecting
the D12 it will revert to its pre-disconnection status.
D12 Amplifier, Hardware manual (4.9 EN) Page 12 of 28