unD4I / unD4I-L
User Manual
Attero Tech LLC 2015
Page 10
614-00020-06
2.3 – Hardware Connections
The unD4I and unD4I-L accept unbalanced or balanced audio from source devices. Refer to the following diagrams and
instructions for connecting different types of audio devices. Professional grade audio cabling is recommended to achieve
the best audio performance throughout the system.
*Note:
The following diagrams refer to the unD4I but apply equally to the unD4I-L as well.
2.3.1 – Input from an Unbalanced Source
To connect a 2-wire unbalanced source to the unD4I, connect the positive output of the unbalanced source to the positive
input of the unD4I. Connect both the source and unD4I input grounds together, and short the negative input of the
unD4I to ground at the input of the unD4I.
Figure 5 - 2-Wire Unbalanced Source Connection
To connect unbalanced sources with a 3-wire connection, short the negative conductor to the shield at the source
connection.
Figure 6 - 3-Wire Unbalanced Source Connection
2.3.2 – Input from a Balanced Source
To connect balanced sources to the unD4I, connect positive output to positive input, negative output to negative input,
and connect the grounds together through the cable shield.
Figure 7 - Balanced Source Connection
