6

ULTRA-DI DI20

1.  Welcome to the 

BEHRINGER Family!

On stage as well as in studios, it is sometimes 

advantageous to connect certain sound 

sources directly to the mixing console. 

Since many instruments (keyboards, 

for example) don’t have balanced outputs 

they require a DI-box. Sometimes, 

even guitars can’t be directly connected to 

mixing consoles because their impedance is 

too high.
By using a DI-box, you can directly tap into 

a high-impedance, unbalanced signal—

for example, a signal between a guitar and a 

guitar amplifier. From this point, you can feed 

this signal directly to a mixing console.
There are active and passive DI-boxes. A passive 

DI-box is more affordable, but its performance 

is dependent on the impedance of the device 

to which it is connected. When the impedance 

on the mixing console’s end changes, so does 

the impedance at the input of the DI-box. 

Such DI-boxes only function properly when 

the connected impedance values are strictly 

specified (high at the input, low at the output). 

Active DI-boxes are not affected by these 

impedance considerations. The input impedance 

of the DI20 is extremely high, and it absolutely 

does not influence the signal flow through the 

DI-box. The output impedance is balanced and 

always very low, whereby the signal is far less 

prone to being affected by noise.

◊ 

To prevent damaging your 

loudspeakers, first connect the 

DI-box and then hook up the 

respective channel. The same goes 

for alternating between battery and 

phantom power operating modes.

2.  Controls

N11999

®

Fig. 2.1: Controls of the DI20