Fishman PRO-EQ PLATINUM User Manual page 9

When not being used for feedback, the Notch control can also be used as a tone
control to subdue an unpleasant frequency in a microphone or room. Play a note
which accentuates the offending frequency and turn the control until the intensity
is diminished.
The Phase switch fl ips the polarity of your instrument signal from positive
to negative, changing its relationship to the sound coming from the amplifi er.
One phase setting usually provides better resistance to feedback than the other
and will vary depending on the instrument and playing environment. Another
approach to determining optimal phase is the selection which sounds or feels
most natural when playing.
In certain playing environments the Phase switch may not have an audible
impact.
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