Setting Up The Amplifier; Rack Installation; Audio Sources With Line Level - Monacor PA-40120 Manual De Instrucciones

are automatically muted when an announce-
ment is made via an input of higher priority . The
priority structure is as follows:
Priority Input
1 (high) PA-4000FMP, PA-4000PTT, PAGING
2 PA-4000RC (PRIORITY = ON)
3 PA-4000RC (PRIORITY = OFF)
4 CH1, CH2, CH3
5 (low) CH4, CH5
⑥
Input priorities
4

Setting up the Amplifier

The amplifier is provided for rack installation
for units with a width of 482 mm (19") but it
can also be used as a tabletop unit . Air must
always be allowed to move freely through all
vents so that a sufficient cooling of the amplifier
is ensured .

4.1 Rack installation

For rack installation, two rack spaces = 89 mm
are required . To prevent the rack from becoming
top-heavy, insert the amplifier into the lower
section of the rack . The front plate is not suffi-
cient for fixing the amplifier safely; additionally
use lateral rails or a bottom plate to secure the
amplifier .
The rack space above and below the ampli-
fier should not be used . The hot air blown out at
the side of the amplifier must be dissipated from
the rack; otherwise, heat will accumulate in the
rack which may not only damage the amplifier
but also other units in the rack . In case of insuf-
ficient heat dissipation, install a ventilation unit
(e . g . DPVEN-04) into the rack .
5 Connections
Prior to making or changing connections, dis-
connect the PA-40120 from the voltage supply
and switch off the units to be connected .
5.1 Speakers
At each output of the amplifier, connect either
100 V speakers to the terminals "100 V" and
"GND" (20) [fig . 3a] – the maximum load by
the speakers at the amplifier output is 120 W;
otherwise, the output may be damaged .
or a speaker or a speaker group with a total
impedance of 4 Ω to the terminals "4 Ω" and
"GND" (20) . The figures 3b to 3d show different
ways to obtain the correct impedance . However,
there are still further possibilities .
When connecting the speakers, always make
sure that the polarity is correct (as shown in
the figures) .
5.1.1 70 V speakers
If only 70 V speakers are available for an output,
the connection contact "100 V" can be switched
to a rated voltage of 70 V as follows:
1) Remove the plug-in screw terminals for the
speaker connection (20) of the desired out-
put from the unit . The jumper for the voltage
selection is now accessible (
12
⑦
Jumper for the rated output voltage
100V
2) Rearrange the jumper according to the de-
sired voltage:
100V
100V
5.2 Microphones 100V
Microphones with an XLR or 6 .3 mm plug may
be connected to the combined XLR / 6 .3 mm jacks
(28) of the inputs CH 1 to CH 3:
1) Turn the control for the input amplification
GAIN (29) towards "MIC" . If required, re-
adjust the control during operation . (If an
announcement via this input is too low, turn
the control clockwise; if the announcement is
distorted, turn the control counter-clockwise .)
2) If a microphone requires phantom power,
press down the switch PHANTOM POWER
(27) . The phantom voltage is only available
at the XLR contacts of the jack .
CAUTION!
1 . Only actuate the switch with the unit
switched off or with the input muted
(switching noise) .
2 . Never connect an unbalanced microphone
when phantom power (15 V) has been ac-
tivated; otherwise, the microphone may be
damaged .

5.3 Audio sources with line level

1) Connect units with a mono output to the
combined XLR / 6 .3 mm jacks (28) of the inputs
CH1 to CH3 . Turn the control for the input
amplification GAIN (29) towards "LINE" . If re-
quired, readjust the control during operation .
(If the signal via this input is too low, turn the
control clockwise; if the sound is distorted,
turn the control counter-clockwise .)
Disengage the switch PHANTOM POWER
(27) if the audio source does not explicitly
require phantom power (phantom voltage
only at the XLR contacts of the jack) .
The jacks are designed for balanced sig-
nals . Audio sources with unbalanced signals
may be connected via 2-pole 6 .3 mm plugs
or via an XLR plug with the contacts 1 and
3 connected . Of course they may also be
connected to one of the RCA jacks (24) of
the channels CH4 or CH5 .
The input channels CH1 to CH3 have
medium priority, i . e . their input signals take
priority over the channels CH4 and CH5, but
they are interrupted by announcements via
the zone-paging microphones PA-4000RC,
the desk microphone PA-4000PTT or an
emergency microphone PA-4000FMP .
For input signals which require the high-
est priority, use the input PAGING (30) with
☞ fig . 7) . plug-in screw terminals (e . g . for a micro-
Z1
SPARE AMP
100V
70 V rated output voltage
100 V rated output voltage
phone with preamplifier or the line level out-
put of a telephone system) .
2) Connect units with a stereo output (e . g . CD
player) to the RCA jacks (24) of the inputs
CH4 to CH5 . Both stereo channels are mixed
to a mono signal in the amplifier .
These inputs take the lowest priority
and are automatically muted by a signal
at a higher- priority input ( ☞
chapter 3) .
5.4 Desk microphone PA-4000PTT
With this desk microphone (separate accessory),
announcements of highest priority can be made .
The PA zones where these announcements
should be heard are selected at the amplifier .
Connect the PA-4000PTT, e . g . with the sup-
plied cable, to the RJ45 jack PTT (32) . The length
of the cable must not exceed 30 m .
5.5 Zone-paging microphone
PA-4000RC
With the zone-paging microphone (separate
accessory), announcements of high priority can
be made . In each case it is possible to select at
the PA-4000RC in which PA zone the announce-
ment is to be heard . Up to 32 PA-4000RC units
can be connected to a PA-40120 .
5.5.1 Installing a connection module
It is necessary first to install the connection
module supplied with the PA-4000RC into the
amplifier . Figure 2 shows the amplifier with the
module installed . The connection module has
two RJ45 jacks (33) to which one PA-4000RC
each may be connected . To each zone-paging
microphone, a further microphone may again
be connected until 32 zone-paging microphones
as a maximum and the amplifier are connected
with each other .
1) Unscrew the two screws of the cover plate
(on the rear side of the amplifier on the very
right) und remove the plate .
2) If only the jack INPUT 1 of the two jacks (33)
is used, the jumper on the PCB of the connec-
tion module must be placed to position ON
for a correct termination of the line . If both
jacks are used, the jumper must be placed
☞
to position OFF ( fig . 8) .
ON OFF
⑧
Connection module for PA-4000RC
with jumper for the terminating resistor
3) Slide the module into the opening on the
rear side of the amplifier . Make sure that the
connector on the module correctly fits into
the socket in the amplifier . Fasten the module
with the two screws .
5.5.2 Connecting zone-paging microphones
1) Connect a jack of the module, e . g . via the
supplied cable, to the RJ45 jack LINK (47) of
the (first) PA-4000RC . If required, connect the
jack INPUT (46) to the jack LINK of another
PA-4000RC etc ., until all units are connected .
The total length of the line must not exceed
1000 m .
table fig . 6 in