rcf UP 4242 Manual De Uso E Instalación página 12

8) "POWER" switch
Used for switching the unit on and off.
9) AC protection fuse
The fuse that protects the power supply circuits in
alternating current can be accessed by removing
the fuse-holder. In the event of a blown fuse or a
change in the power supply voltage, the fuse may
only be replaced by an RCF S.p.A. SERVICE CENTRE.
10) "24V D.C." terminals
These terminals are used for supplying the
amplifier in direct current, for example in the case
of emergency, by means of an external 24 Vdc
source (e.g. 24 V battery). If the alternating
current is cut off, the unit is automatically
supplied in direct current, thus ensuring
continuous operation.
11) "OUTPUT" terminals
These 5 terminals are used for connecting
speakers to the 4Ω , 8Ω , 50V, 70V, and 100V
outputs of the unit.
12) "TONE CONTROL" key
When this key is lowered, the low, middle, and
high tone controls (ref. 20-21-22-23) are
excluded.
13) "PROTECT. OUT" terminals
These two terminals are connected to the contact
of an alarm relay inside the unit, which closes the
contact when one of the following protection
functions is tripped:
a. protection against fan faults. The "FAN FLT"
LED (see point 1) lights up when this protection
device has intervened.
b. protection against overheating. The
"OVERHEAT" LED (see point 2) lights up when this
protection device has intervened.
c. protection against excessively high input
signals, overloads, and short circuits on the
outputs. The "OVERLOAD" LED lights up when one
of these protection devices has intervened.
The terminals can be used to transmit any alarm
condition on the amplifier to external devices
(e.g. amplifier control boards).
14) "PRIORITY COMMAND" terminals
By short circuiting these terminals together (e.g.
by means of an electrical contact), the priority
function is enabled, which gives "INPUT 1"
priority over "INPUT 2". The priority function
excludes "INPUT 2" so that only the audio signal
that drives "INPUT 1" is transmitted through the
"OUTPUT" speakers connected to the speaker
outputs.
15) "INPUT 2" on RCA sockets
Input 2 for the audio signal to be amplified. When
the priority function is not enabled (see point 14
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16) "INPUT 2 GAIN" control
17) "INPUT 2" on terminal strip
18) "INPUT 1" on terminal strip
19) Power cable socket
20) "LOW" control
21) "MID - Hz" control
22) "MID - dB" control
12
"PRIORITY COMMAND TERMINALS"), the signal
that drives this input is normally amplified and
transmitted by means of the "OUTPUT" speaker
outputs (ref. 11). The RCA sockets of the input can
be used as an alternative to the terminal strip
(17), and permit connection of audio sources that
supply an unbalanced stereo signal in output.
This control is used for adjusting the gain of
"INPUT 2". To adjust the gain level, use a small
screwdriver to turn the control. Turning clockwise
increases the gain from 0 dB (control turned
completely anti-clockwise) to -20 dB (control
turned completely clockwise).
Input 2 for the audio signal to be amplified. When
the priority function is not enabled (see point 14
"PRIORITY COMMAND TERMINALS"), the signal
that drives this input is amplified normally and
transmitted through the "OUTPUT" speaker
outputs (ref. 11). The terminal strip of the input
can be used as an alternative to the RCA sockets
(15), and permits connection of sources that
supply a balanced or unbalanced audio signal in
output.
Input 1 for the audio signal to be amplified. To
amplify and transmit the audio signal that drives
this input, it is necessary to enable the priority
function using the terminals (14). The terminal
strip of the input can be used as an alternative to
the XLR socket (24), to which it is connected in
parallel, and permits connection of sources that
supply a balanced or unbalanced audio signal in
output.
Used for connecting the power cable supplied
with the unit.
This knob accentuates (clockwise rotation) or
attenuates (anti-clockwise rotation) the low
frequencies. The range of adjustment is ±12 dB.
When the knob is in the central position, the
frequency response is not altered.
Together with control (22), this control makes it
possible to adjust the parametric equalizer for the
middle frequencies. Using this knob, you can
select the intervention frequency between the
values of 250 Hz and 8kHz.
Together with control (21), this control makes it
possible to adjust the parametric equalizer for the
middle frequencies. Using the knob, you can
accentuate (clockwise rotation) or attenuate (anti-