7

ULTRA-DI DI20

(1) 

CH. 1 IN

 input is used to connect 

unbalanced as well as balanced signal 

sources to channel 1.

(2) 

CH.1 OUT

 is the balanced output at mic 

level for channel 1.

(3) 

CH.2 IN

 input is used to connect 

unbalanced as well as balanced signal 

sources to channel 2. In Link mode 

(see 

(6)

) this connector functions as 

output and sends the signal 

directly from channel 1.

(4) 

CH. 2 OUT

 is the balanced output at 

mic level for channel 2. In Link Mode 

(see 

(6)

) this connector sends the signal 

directly from channel 1.

(5) 

The 

ATTENUATION

 dampening switch 

considerably increases the useful 

operating range of the DI20 from low 

signal levels of a high-impendence 

microphone or a guitar, all the way 

to the speaker connectors of a guitar 

amplifier (solid state). You can 

select between 20 and 40 dB worth 

of attenuation.

◊ 

You should only use the ATTENUATION 

switch when your DI20 rather than 

the mixing console preamp begins 

distorting. Otherwise refrain 

from using this function to avoid 

excessive dampening.

(6) 

The 

MODE

 switch lets you select the 

operating modes of the DI20. In the 

2-CH mode, two independent signals 

can be connected to channels 1 and 2 

respectively. In 

LINK

 mode the DI-box 

functions as a splitter: One signal can 

be fed to the channel 1 input and split 

into two balanced signals (at outputs 

1 and 2) and an unbalanced signal 

at CH.1 OUT. The un-balanced signal 

can, for example, be connected to an 

additional amplifier.

◊ 

When connecting a tube amplifier 

to the input of the DI20, please keep 

in mind that an appropriate load 

resistance (e. g. a loudspeaker) 

must be connected to the CH.1 OUT 

(LINK MODE) connector.

(7) 

The 

BATTERY

 switch activates the 

battery powered mode. Set the battery 

operating mode to OFF when your 

DI20 is connected to phantom power. 

While setting it to OFF, brief whistling 

noise may occur. This is completely 

normal and needs no further attention. 

However, you should not change the 

battery switch when you have an amp 

connected. For battery operation, 

you’ll only need a commercial 9 V 

battery of the 6LR61 type.