Meyer Sound MJF-212ATM Manuale Utente

6

The blue input connector serves as the input for 

all the units 

looped in that circuit and is rated at 20 amps maximum. 
Please make sure never to exceed 20 amps on any single 
connector. Refer to Table 2.1.

Table 2.1: Maximum looping capabilities for MJF-212A

Circuit Breaker/
Connector Rating

115 V AC

230 V AC

100 V AC

15 amps

2 Looped-out
(3 total) 

5 Looped-out
(6 total)

1 Looped-out    
(2 total)

20 amps 

3 Looped-out
(4 total)

7 Looped-out
(8 total)

2 Looped-out
(3 total)

 

Do not exceed the current 

capability of the 20-amp MJF-212A 

loudspeaker AC connector. When looping always 
take into account the current draw of all the 
speakers in the circuit, 

including the first unit.  

 For best performance, the AC cable 

voltage drop should not exceed 10 volts, or 

10 percent at 115 volts and 5 percent at 230 volts. 

The MJF-212A monitor requires a grounded outlet. Use the 
AC cable wiring diagram below (Figure 2.3) to create power 
connectors.

If the colors referred to in the diagrams don’t correspond to 
the terminals in your plug, use the following guidelines:



Connect the blue wire to the terminal marked with an N 
or colored black.



Connect the brown wire to the terminal marked with an 
L or colored red.



Connect the green and yellow wire to the terminal 
marked with an E or colored green or green and yellow.

 For units shipped with the VEAM 

all-in-one multipin connector, please refer to 

Appendix A for AC Power pin-out.

 

When creating AC cables 

and distribution systems, it is important 

to preserve AC line polarity and connect earth 
ground on both sides of the cable. MJF-212A 
monitors require a ground connection. Always use 
a grounded outlet and plug. It is very important that 
the system be properly grounded in order to operate 
safely and properly. Do not ground-lift the AC cable.

When AC power is applied to the MJF-212A stage monitor, 
the Intelligent AC power supply automatically selects the 
correct operating voltage, allowing the unit to be used 
internationally without manually setting voltage switches 
or jumpers. In addition to selecting the operating voltage, 
the Intelligent AC power supply performs the following 
protective functions to compensate for hostile conditions on 
the AC mains:



Suppresses high-voltage transients up to several  
kilovolts



Filters common mode and differential mode radio  
frequencies (EMI)



Sustains operation temporarily during low-voltage  
periods



Provides soft-start power-up, eliminating high inrush 
current

The MJF-212A stage monitor operates safely and without 
audio discontinuity if the AC voltage stays within either of 
two operating windows at 50 or 60 Hz: 



85 to 134 volts 



165 to 264 volts 

The MJF-212A can withstand continuous voltages up to 
275 volts and allows any combination of voltage to GND 
(that is neutral-line-ground or line-line-ground). 

 

Continuous voltages higher than 

275 volts can damage the unit.