LD Systems LD PRO SERIE Manual De Usuario página 7

CONNECTIONS:
The passive versions of the cabinets have 2 Speakon compatible sockets; one socket is used for looping through
the signal to the next cabinet. The active version is first connected to the 230 V AC power mains with a power
cord. The following audio inputs are available:
LDP82A, LDP102A, LDPN122A2 and LDPN152A2 - balanced line input via XLR and unbalanced line input via
2 cinch sockets (RCA), balanced microphone input via XLR and unbalanced microphone input via 6.3mm TRS
plug. The sensitivity of each can be adjusted using the adjacent level control.
The LDPN152A2 has two microphone inputs with separate volume controls.
The XLR line input is balanced. Unbalanced line signals can be connected via the RCA sockets. There are two
connectors (L & R) for a stereo signal that is mixed down to mono internally. The volume is determined by the
adjacent level controls. Of course, the line and microphone inputs can be used at the same time. The master
volume is controlled by the third volume control below the other two. A shared 2-band tone control affects treble
and bass. A bass boost switch on the LDPN122A2 and LDPN152A2 additionally permits a boost of 3 dB @ 100
Hz (LDPN122A2) and 6 dB @ 100 Hz (LDPN152A2). At high volumes, it is advisable to deactivate the bass boost,
because otherwise the power amplifier enters the clipping range sooner.
Before turning on the unit with the power switch (the green power LED serves as an indicator lamp), all level
controls should be set to the MIN position. Otherwise, connected microphones may cause unintended feedback.
Start with the tone controls in the centre position. The levels of the various sources are balanced with one
another using the associated level knobs; the master volume is determined with the third level control (master
volume). The red clip LED lights up to indicate when the amplifier reaches the clipping range. This should be
avoided. If you connect mains-powered instruments that are grounded by a protective contact to the inputs of
the active cabinet, a ground loop may result due to double grounding. You can eliminate this low-frequency hum
by activating the ground-lift switch. All cabinets have a blue signal LED on the front which lights up as soon as a
signal is connected to the cabinet.
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