A signal post preamp is normally a line level one. You
should use XLR inputs, NOT 1/4". Eclipse manual and our website
technotes dscribe the soldering necessary to use line level signals
from 1/4" unbalanced sources connected to an Eventide balanced XLR
Another problem might be caused by the fact you are very
likely using a single Eclipse input. When this is the case you have to
enter LEVELS > Input Mode and select Mono 1 or 2, according to which
input # is connected on your machine.