Filter
Top Products
SERVICING, INSTALLATION AND CON-
FIGURATION INTRUCTIONS
CAUTION:
These servicing and installation
instructions are for use by qualified personnel
only. To reduce the risk of electric shock do not per-
form any servicing other than that contained in the
operation instructions unless you are qualified to do
so. Refer all servicing to qualified service person-
nel.
CAUTION: Before removing the top cover dis-
connect the unit from the mains supply.
INSERT SYSTEM CONFIGURATION.
Altering jumpers inside the unit can change the
way the insert and variable level functions work so
that the NAD-911 can be configured to meet the
messaging requirements of the system. This must
be done by qualified personnel only.
WHY USE DIFFERENT INSERT SETTINGS?
Whilst the basic function of accurately setting the
music levels to individual speakers is generally the
same in all installations, the announcement require-
ments may vary enormously. The Insert configura-
tion allows installers to match the operation of the
NAD-911 exactly to the announcement needs of the
user.
MICROPHONE LINE OUT LEVEL, FIXED OR
VARIABLE.
If the system is being used in an area where the
music level needs to be varied as the background
noise varies,then the announcement levels should
also go up or down with the music level. This
ensures that the announcements will be heard over
the music and general background noise in the area.
In this situation the insert function of each channel
should be set to Insert Variable.
If the system is being used in an office or shop
type of venue where the music level is only occa-
sionaly altered and set to low background level, then
the Microphone level needs to be set up so that
announcements can be heard clearly but are not too
loud. Setting all channels to Insert Fixed helps to
ensure that the correct announcement levels are
maintained.
Some areas of the installation may never need
announcements. Configure the channels feeding the
speakers in these areas to Insert Disabled to ensure
that announcements are not accidentally routed to
these areas.
CONFIGURING THE NAD-911 INTERNAL
JUMPERS.
With the unit unplugged from the AC socket,
remove the lid by removing the 5 screws securing
the top panel. When the 911 has been configured
securely replace the unit’s top panel.
FIXED OR VARIABLE MICROPHONE LINE
OUT LEVEL.
In most installations using multiple NAD 911, it will
be desirable to give the first 911 control over the
microphone level for all 911s in the system. In this
case the first 911 should be set to Variable and all
following 911s should be set to Fixed. This way the
second and subsequent 911s will not alter the
Microphone Line out level to the next 911.
Change jumper JP25 from the factory default set-
ting ‘VARIABLE’ to the ‘FIXED’ position.
CONFIGURING MICROPHONE AND MUSIC
LEVELS.
Each channel can be configured individually so
that the Microphone or Line Insert volume level will
always be the same regardless of the individual
channels level setting. Alternatively the channel can
be configured so that the Microphone level is linked
to the level of the music. Turning up the channel’s
level control will then also turn up the volume of the
microphone.
A third setting switches off the microphone signal
from that channel completely.
NOTE: For all channels the factory default is set to
Variable.
FIXED MICROPHONE LEVEL.
To set up the channel so that the level of the
Inserted signal (Microphone or pre-recorded mes-
sage) to be at a preset level no matter what the indi-
vidual channel volume setting is.
Set the four jumpers for that channel to INS
FIXED.
LINKING MICROPHONE AND INPUT
LEVELS.
To set up the channel so that the channel level
control alters the volume of both the music and insert
levels. Set the four Jumpers for that channel to INS
VARIABLE.
DISABLING MICROPHONE INSERT ON A
CHANNEL.
If you don’t want the Insert signal to ever appear
on a particular channel. Set the channel’s first two
jumpers (JP -01 and JP -02) to INS FIXED and set
the second two jumpers (JP -03 and JP -04) to INS
VARIABLE
CAUTION: Do not use any other configuration of
the jumpers.
NA
D
8
GB