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