ENGLISH
OPERATION MANUAL
JB SYSTEMS
®
6/44
PM4.2 MEDIAMIX
33. Balanced stereo master output:
Balanced stereo JACK output carrying the main output signal
controlled by (11)/(12).
34. Balanced stereo master output:
Balanced terminal block output carrying the same signal as output
(33), often used for fixed installations.
35. Mono switch for master 2:
used to convert the stereo output to simple mono for use with small
background music speakers in toilets, terraces, corridors, …
36. 100Hz High-Pass filter for master 2:
This helps to reduce the low-frequency energy on the master 2
outputs. This is specifically useful if a zone is used to feed a background music system which may
consist of relatively small wall or ceiling speakers. Such small speakers don’t support low frequencies.
37. Tone control for master 2:
used to adjust the sound of master 2. The EQ (10) on the front panel is only
used for master 1.
38. Record output:
This is an unbalanced stereo output carrying the same signal as the main outputs
32/33/34, but not influenced by the main volume controls (11/12). This is normally used for recording the
output to an external tape, CD or memory device.
39. Line inputs:
These are line-level RCA/cinch inputs for channels LINE1 and LINE2 (7) on the front panel.
40. Gain controls for the line inputs:
used to adjust the input sensitivity to compensate the different source
volumes.
41. Emergency input:
This is an auto-sensing, balanced terminal block input which allows the connection of
an emergency evacuation system. Once an audio signal is present on this input, all output signals will be
muted and the emergency message/signal from this input will become audible instead.
Microphone routing for muting/emergency:
Depending on the
application, user habits and local safety requirements, it can be
useful to either enable or disable the local microphone during an
emergency case where an incoming emergency signal into the
emergency input (41) shuts down all program signals. The
advantage of disabling the microphones for this case is that the
local user can not interfere the legibility of the emergency
announcement by using his own microphone, the disadvantage is
that if for whatever reason the emergency announcement does not
stop, the local user can still give emergency/evacuation guidance
by means of the local microphone. As a factory default, the
microphones are not muted during an incoming emergency
message. To change this, a qualified installer or technician must
open the unit after disconnecting it from AC supply. Refer to the
dra
wing to locate jumper “Emergency MIC setting” on the front
panel PCB: set the jumper in the desired position..
42. Emergency volume control:
This control sets the volume of the emergency input (41) sent to all
outputs.
43. Music Mute input:
This is a terminal block input which allows to remotely mute the masters by simply
shortening the contacts.
Important note:
during the installation you can choose to include or exclude the microphone signals
from this muting process, please see
“
Microphone routing for muting/emergency
” in (41) for more
information.
44. FM antenna input:
connect any suitable 75 ohms FM-antenna here. If needed used the supplied
adapter.
IR-REMOTE
Used to remotely control certain basic functions of the tuner & media player.
L. Transport Controls:
the 4 buttons allow you to start and pause a track, and
further skip to the next track or back to the beginning of the current track.
These controls are inactive in FM mode.
M. Source button:
for functions see button n° 19 on the front panel.
N. Mute button:
mutes the output of the internal media player / radio.
O. Volume control:
changes the volume of the internal media player / radio.
Note that the volume goes back to the standard setting when you switch the
PM4.2 off and back on.
P. FM-radio preset buttons:
allows you to remotely select one of the 9 FM-
station presets.
