Behringer Ultra-DI DI400P Leaflet

Thank you for showing confidence in BEHRINGER 

products by purchasing the ULTRA-DI DI400P. 

The DI400P is a high-performance passive direct 

injection box. 
◊  Please read the safety instructions that 

Being on stage or in the studio, musicians often look 

for ways to connect certain signal sources directly 

to the mixing console. Even though this approach 

has obvious advantages, there are still some 

technical hurdles obstructing its implementation. 

For example, keyboards seldom feature balanced 

outputs, and guitars can not be directly connected 

to mixing consoles because of the high impedance 

of guitar signals.
The DI400P lets you directly tap into a 

high-impedance, unbalanced signal—for example, 

the signal between a guitar and a guitar amp. 

From there on, you can feed the signal directly to a 

mixing console.

(1)

(3)

(2)

(4)

Fig. 1: Top view

(1) 

+ 

(2) 

PARALLEL IN/OUT (¼" TS): 

These connectors are used for connecting 

unbalanced signal sources. Because both 

connectors are wired in parallel, they can be 

used both as an input and as a direct output to 

loop the signal through to a monitor amplifier.

(3) 

OUTPUT (XLR): This is the balanced mic-level 

output. Use a high-quality balanced 

microphone cable to establish connection.

(4) 

Using the GND LIFT (ground lift) switch, 

you can fully separate input and output 

grounding. Depending on how the equipment 

to which your DI400P is connected is 

grounded, using the GND LIFT switch lets you 

lower hum noise or ground loops. When the 

GND LIFT switch is in LIFT position, the ground 

connection is interrupted.

The SERIAL NUMBER of the DI400P is located 

at the bottom.

Instrument Input

Parallel Out

Microphone Input

In

Out

Fig. 2: Guitar 

→ DI-box → guitar amp/mixer

This illustration shows the application of a DI-box. 

The signal feeding the amplifier remains unchanged; 

it is simply taken and routed into the amp.  

The low-impedance balanced signal is forwarded to 

the mic input of the mixing console. This application 

has its advantages particularly with bass guitars, 

because very few microphones can linearly transmit 

bass frequencies with high signal levels. If you are 

using effects, insert the DI400P after the effects 

device, so that you can monitor the effects via the 

PA system or the recording as well.