Behringer Stereo System DI4000 Manual De Usuario

ULTRA-DI PRO DI4000 User Manual

Before you switch on the unit, check that it is configured to match your AC 

mains voltage requirements. If it does not comply, then it is necessary to switch 

the operating voltage to the correct supply requirements BEFORE turning on 

the unit, otherwise the unit could be severely damaged. You will find this 

combined fuse holder/voltage selector at the back, adjacent to the IEC receptacle. 

built for one operating voltage only. 
The AC voltage selection is defined by the position of the fuse holder. If you 

intend to change the operating voltage, remove the fuse holder and twist it 

by 180 degrees before you reinsert it. Matching the two markers shows the 

selected voltage.

A safety fuse protects the unit from serious defects. If the fuse blows, this is a 

warning sign and always indicates that the circuit is overloaded. The fault must 

always be repaired before the fuse is replaced. If the safety fuse is faulty and 

needs replacing after the unit is repaired, please make sure that you replace it 

only with the identical type and rating. NEVER use fuses of different ratings or 

cover faulty fuses with aluminium foil. This can cause fire and electric shocks and 

will endanger your life and the lives of others.

As standard, the BEHRINGER ULTRA-DI PRO is installed with transformer-

balanced outputs. This transformer features automatic hum and noise 

reduction for balanced signals and thus allows for trouble-free operation, 

even at high operating levels. Externally induced mains hum etc. will be 

effectively suppressed. 

Pin 1

Pin 2 = (+) Signal

Positive

Pin 3 = (-) Signal

Shield

(+) Signal + Hum

(-) Signal + Hum

Negative

(+) Hum + Signal

(-) Hum + Signal

2 x Signal

Ground

RFI and Hum

= Signal + 6 dB

1

2

3

1

2

3

Fig. 3.1: Compensation of interference with balanced connections

For connection of balanced and unbalanced plugs,
ring and sleeve have to be bridged at the stereo plug.