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 Page 5 

OR:  

Connect 100 V line speakers between the 

100V

 terminal and the 

COM

 terminal. 

ADD UP the total of the stated powers on each loudspeaker, or, if the speakers 
are fitted with selector switches, add the selected power. 
The total power of all the connected speakers MUST BE LESS THAN 120 W. 

DO NOT

 connect low impedance speakers to the 100V terminal, 

Make no connection to the 

4-

8Ω 

or

 70V 

terminals 

 
 

Setting Up 

ALWAYS  turn the MASTER volume controls to zero before switching on; do  not 
touch  the  speaker  outputs  whilst  the  amplifier  is  running  as  this  could  result  in 
electric shock.  
Set the MASTER level control to about 75% of full clockwise rotation. 
Then  adjust  the  microphone  level  controls  MIC1,  MIC2,  and  MIC3  until  the  0dB 
indicator illuminates only on the loudest peaks. 
Adjust  the  line  level  control  LINE  1,  LINE  2  and  LINE  3  for  a  comfortable 
background music level 
Adjust  the  MASTER treble  and  bass  controls  for  the  greatest clarity when using 
the microphone. 
The  MUTE  control  allows  the  level  of  background  music  to  be  reduced 
automatically when the microphone MIC1 is being used. Adjust the MUTE control 
(on the rear panel) for the greatest clarity of microphone announcements. 
Note that the MUTE facility only operates on microphones connected to the MIC1 
input.. 
 

Operation 

Press  the  CHIME  button  for  a  two-tone  chime.  When  the  Chime  has  finished, 
press the “push-to-talk” switch on the microphone and make the announcement. 
Release the “push-to-talk” switch when the announcement is completed. 
If using a microphone without a “push-to-talk” switch, then rotate the MIC volume 
control fully anticlockwise when not in use. After the chime has finished, rotate  
Note  that  a  licence  is  required  from  Phonographic  Performance  Limited  to  play 
radio or copyrighted music in any public place (including shops, factories, offices, 
hotels and public houses)

Summary of Contents for NJS401

Page 1: ...Page 1 NJS401 120 Watt 100 Volt line Mixer Amplifier ...

Page 2: ...ly Make sure that air intakes and exhausts are not obstructed Do not use this product in the immediate surroundings of a bath shower or swimming pool Do not place the mains lead beneath a carpet or rug Do not insert any object into this product through the grilles This may damage the heater or result in overheating or electric shock PAT Testing When used in a workplace this product must be safety ...

Page 3: ...t as mains cabled 100 Volt line loudspeakers The 100V line system was developed to allow a long distance between loudspeakers and the amplifier and to allow a large number of speakers to be connected to each amplifier In order to do this the audio is transmitted at a much higher voltage 100V rms than with a conventional low impedance amplifier such as a hi fi or disco amplifier Each loudspeaker is...

Page 4: ...nce lower than 4 Ω Make no connections to the 70V or 100V terminals The following combinations MAY be connected Speakers Combined impedance 1 16 Ω 16 Ω 2 16 Ω 8 Ω 3 16 Ω 5 3 Ω 4 16 Ω 4 Ω 1 16 Ω 1 8 Ω 5 3 Ω 2 16 Ω 1 8 Ω 4 Ω 2 8 Ω 4 Ω 1 4 Ω 4 Ω The following combinations MUST NOT be connected Speakers Combined impedance 5 16 Ω 3 2 Ω 3 8 Ω 2 7 Ω 4 8 Ω 2 Ω 1 4 Ω 1 8 Ω 2 7 Ω 1 16 Ω 2 8 Ω 3 2 Ω 2 4 Ω 2 ...

Page 5: ... and LINE 3 for a comfortable background music level Adjust the MASTER treble and bass controls for the greatest clarity when using the microphone The MUTE control allows the level of background music to be reduced automatically when the microphone MIC1 is being used Adjust the MUTE control on the rear panel for the greatest clarity of microphone announcements Note that the MUTE facility only oper...

Page 6: ...a dry 1 25mm paint brush remove any dust from the grilles If the mains lead is damaged it must be replaced by the manufacturer or an authorised service centre If the mains plug needs to be replaced proceed as follows Connect the brown wire to the terminal labelled L Connect the blue wire to the terminal labelled N Connect the green yellow wire to the terminal labelled with the earth symbol or E Ma...

Page 7: ...dB Hum and noise 85 dB Harmonic Distortion 0 5 at full power output Power requirement 230V 50 Hz 160 VA Fuse T2A 5 20 mm 2 Amp ANTI SURGE 5 20 mm Connections Mains built in cable Input microphone jacks Input line RCA phono plugs Output spring terminals Disposal and Recycling You must not dispose of this product with domestic household waste Most local authorities have specific collection system fo...

Page 8: ...ls and workmanship for a period of twelve months Should this product be operated under conditions other than those recommended at voltages other than the voltage indicated on the product or any attempts made to service or modify the product then the warranty will be rendered void The product you buy may sometimes differ slightly from illustrations This warranty is in addition to and does not affec...

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