Connections, Operating And Display Elements - LD Systems DSP 44 K Manuel D'utilisation

CONNECTIONS, OPERATING AND DISPLAY ELEMENTS

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DISPLAY
Multi-functional LC screen for display of speaker presets, audio signal level and channel mute. It also shows menu items in the edit menu,
allowing system settings to be made as required.
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MENU / ENTER
Combined push-and-turn dial to access the edit menu and select and edit individual menu items.
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EXIT / LOCK
1. EXIT: Press the button briefly to move up one level in the menu structure to the main display (more than once if necessary).
2. LOCK: Press and hold the button for about 5 seconds to lock the controls and prevent unintentional
and unauthorised changes being made. To deactivate the lock, press and hold the MENU dial for approximately 3 seconds.
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SELECT / MUTE A - D
1. SELECT: Briefly press the relevant button to select the desired channel in the edit menu.
2. MUTE: Press and hold the relevant button for about 3 seconds to mute the selected
channel and for about 3 seconds to unmute it.
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CLIP
The CLIP LED display lights up when the relevant amp channel is operated in the upper threshold range. Brief illumination of the LED is
uncritical here. In order to protect the system, an excessive signal level is gently down-regulated by the integrated limiters. If the CLIP LED
lights up for a prolonged period or permanently, reduce the volume level.
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PMS (POWER MANAGEMENT SYSTEM)
The PMS is a an electronic protection system which permanently monitors the main amp parameters so as to only draw from the power
supply the amount of current required to maintain safe operation (monitoring of
signal input, capacity, temperature, current). The PMS LED lights up in the following situations:
1. During the power-up process until the amp is fully functional. The outputs are muted at the same time.
2. Due to unfavourable operating conditions, the internal temperature rises to near the point when the system would automatically
shutdown to prevent overheating. Here the system takes control, restricting current
so as to maintain operational continuity at the power level which the amp is capable of withstanding at that particular moment.
3. Excessive mains current consumption. This only occurs either under laboratory conditions during protracted sinusoidal signal testing
using dummy loads or in conditions of prolonged acoustic feedback. Here the PMS takes control to avoid any damage to the speakers
and to prevent the mains breaker from tripping or the fuses blowing.
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DATA
The USB interface enables management and control of the DSP amp via LD Systems OCS software (can be downloaded free of charge on
the product page at WWW.LD-SYSTEMS.COM).
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VENTILATION GRILL
In order to avoid overheating of the device, ensure that the ventilation grill is not covered and that air can circulate freely.
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