Owner`s manual

The output level can be adjusted also by connecting the soundcard in loopback. In
this configuration the output signal is taken from the Preamplifier output Jack and its
level is displayed on the 2 VU-Meter bars.
Loopback configuration:
The picture above shows a loopback connection obtained by using the provided stereo
RCA-RCA cable. The same connection can be obtained also by using a stereo JACK-
JACK cable (connecting Stereo IN to Stereo OUT) or in other ways, for example using
a stereo Jack to 2 RCA cable.
X4 Owner's Manual - Rev. 1.4 - page 18