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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
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
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
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
CAUTION: Do not use any other configuration of the jumpers.
NAD
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