LD Systems AMP 405 Manuel D'utilisation page 9

MODE 1–2
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Before using the device, make sure that the switch is in the correct position!
ST: Stereo mode. INPUT 1 is routed to OUT 1 and INPUT 2 to OUT 2.
PAR: Parallel mode. INPUT 1 and INPUT 2 are simultaneously summed to mono and routed to OUT 1
and OUT 2. The volume of the two channels is set individually using the VOLUME 1 and VOLUME 2
level controls on the front panel.
HPM: High-Power Mode makes it possible to connect speakers or speaker lines with an impedance
of 2 ohms to the amplifier (amplifier power: 100 W @ 2 ohms). When using loads with higher
impedance, the advantages of HP mode may not be fully utilised. Use INPUT 1 as the signal input
and the VOLUME 1 level control on the front panel to adjust the volume.
Caution! Please ensure terminal block poles are correctly assigned (see TERMINAL BLOCK
CONNECTIONS in this manual).
MODE 3–4
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Before using the device, make sure that the switch is in the correct position!
ST: Stereo mode. INPUT 3 is routed to OUT 3 and INPUT 4 to OUT 4.
PAR: Parallel mode. INPUT 3 and INPUT 4 are simultaneously summed to mono and routed to OUT 3
and OUT 4. The volume of the two channels is set individually using the VOLUME 3 and VOLUME 4
level controls on the front panel.
HPM: High-Power Mode makes it possible to connect speakers or speaker lines with an impedance
of 2 ohms to the amplifier (amplifier power: 100 W @ 2 ohms). When using loads with higher
impedance, the advantages of HP mode may not be fully utilised. Use INPUT 3 as the signal input
and the VOLUME 3 level control on the front panel to adjust the volume.
Caution! Please ensure terminal block poles are correctly assigned (see TERMINAL BLOCK
CONNECTIONS in this manual).
SETTINGS
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DIP switch 1 AUTO STB: Move the switch to the ON position to activate the device's automatic
standby function.
If the standby function is activated, the amplifier is automatically switched to standby mode
if no audio signal is detected for approx. 20 minutes. This reduces energy consumption in a
sensible way. As soon as an audio signal is present again, the amplifier is automatically powered
up from standby mode and is fully operational again within approx. 3 seconds.
The power symbol on the front panel lights up red in standby mode. If the power symbol lights
up white, the device is ready for operation.
DIP switch 2 X-OVER: The crossover function can be used to create a passive speaker system with
subwoofers plus satellite speakers. Slide the switch to the ON position to activate the crossover
function. OUT 1 and 2 are provided with a low-cut filter and OUT 3 and 4 with a high-cut filter. OUT 1
and 2 power amplifiers are now ready to control satellite speakers and OUT 3 and 4 subwoofers.
STANDBY
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Standby mode can be activated manually using an external button (momentary switch).
Press the button to activate standby mode and mute the speaker outputs. Press the button
again to end standby mode. The standby function via an external button has priority over the
automatic standby function (see SETTINGS).
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