Lab.gruppen FP 6400, Руководство пользователя, Страница: 15 / 20

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Speaker connections are made via the two Neutrik® NL4FC Speakon connectors. The Speakon
connector is designed for high power speaker connections. It assures the correct polarity, it locks in place
and prevents from shock hazard.
They are wired in the following manner: The right jack, Channel A, provides both channel A and B
outputs, so it is useful for bridge and bi-amp operation (see bridge mono operation on page 7 ). The left
Speakon, Channel B, carries only the channel B output.
Channel A and B into two separate
Speakons
Channel A and B into one Speakon
(Stereo and Bi-amp)
Bridge mono
Never connect either output terminal to ground or to some other output or input terminal.
For regular two-channel operation connect each speaker load across the output’s positive and negative
terminals.
Pay attention to speaker polarity; loudspeakers connected out of polarity degrade sound
quality, and may be damaged as a consequence.
Keep the speaker cable leads as short as possible, and use a good quality stranded speaker cable. Do not
use shielded leads, such as microphone or guitar cable. Remember that the speaker cable robs the power
of the amplifiers in two ways: by increasing the load impedance, and by introducing resistive power
losses.
WARNING: To prevent from electrical shock, do not operate the amplifier with any
portion of the speaker wire’s conductor exposed.
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•
Make sure that the power switch is set to “off” before connecting any input or output, or
operating the switches on the rear panel. See page
10 regarding installation.
•
Make sure that the AC mains voltage is correct, and the same as the one printed on the rear
panel of the amplifier. See page
11 regarding operating voltage and power consumption.
•
Make sure that the switches on the rear panel for operation modes, gain switch, clip limiters,
and the MLS switches are in the correct position. See page
7 regarding operation modes, page
15 regarding clip limiters, and page 8 regarding the MLS switches.
•
It is always a good idea to turn down the gain controls during power-up to prevent from speaker
damage in case of a high signal being present at the input.
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When you power up the amplifier it takes a couple of seconds to check its circuits. This is known as the
"soft-start" or "slow-start" sequence. The fans first blow at high speed before going into "idle", and the
two bottom green LED’s illuminate to show that the amplifier is operational.
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