Behringer DI4000 3.3 Audio connections, Output, Cable, Input, strain relief clamp, sleeve, ring, tip

8ULTRA-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.

IMPORTANT: This does not apply for general export models which are 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.

◊If the unit is switched to another operating voltage, the fuse rating must be changed. See the technical specifications in the appendix.

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.

3.3 Audio connections

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.

◊Please ensure that only qualified persons install and operate the ULTRA-DI PRO. During installation and operation the user must have sufficient electrical contact to earth. Electrostatic charges might affect the operation of the ULTRA-DI PRO!

Output

Pin 1

Pin 2 = (+) Signal

Pin 3 = (-) Signal

Cable

2		1	Shield
			(+) Signal + Hum
	3
			(-) Signal + Hum

RFI and Hum

Input

Ground

1		2
	3	Positive	(+) Hum + Signal
	3
		Negative	(-) Hum + Signal
			2 x Signal
			= Signal + 6 dB

Fig. 3.1: Compensation of interference with balanced connections
Unbalanced use of mono ¼" jack plugs	Balanced use of stereo ¼" jack plugs
strain relief clamp	strain relief clamp
sleeve	sleeve
	ring
tip	tip

sleeve	sleeve
(ground/shield)	ground/shield
	ring
	cold (-ve)
tip	tip
(signal)	hot (+ve)

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