ULN-8/LIO-8 Jumper Settings
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Connecting unbalanced sources
It has been our experience that it is best to have the ground jumpers
installed
when connecting
unbalanced sources to the line inputs.
Output levels
Jumpers can be installed to raise the operating output level of the analog outputs. There are a few reasons
why they are not installed by default:
• The factory configuration of the ULN-8 Line outputs is +18 dBu, which is a very common level for
interfacing with a large majority of existing gear.
• The noise performance is better optimized when the outputs are set to to Monitor mode when
interfacing with powered monitors.
• The box runs cooler and uses less power.
• The jumpers can always be applied to raise the outputs to +24 dBu, for a chain that is optimized at
this operating level (i.e. chains at many mastering studios). At this level, 0 VU = -20dBFS.
Figure E.6: Output Level Jumper Sites
These jumpers are located on the largest circuit board, in line with the Line/Monitor output connector.
In the diagram above, the channels are in the following order from left to right: 2 1 4 3 6 5 8 7. In each
case, J11 corresponds to the even (right) channel of the pair, and J8 corresponds to the odd (left) channel
of the pair.
