Sound Devices 552 - Manual (Page 21)

552 User Guide and Technical Information
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When possible, attempt to equalize at the sound source with microphone selection, placement,
windscreens, and onboard microphone filtering. Many microphones have on-board high pass filters.
Use the high-pass filters on the 552 in conjunction with the microphone’s filter to increase the filter’s
slope.
The filter can be removed from the circuit completely by moving the high-pass filter control to the
full counter-clockwise (detented) position. The high-pass filter potentiometer can be adjusted easily
and then recessed to hide it from the mixing surface.
Pan Control
The pop-up knob control routes inputs to the left and right output buses. For most applications, a
channel will be panned either hard-left, hard-right, or center. The pan pot has a detent in the center
position. After setting the pan, the pan control can be recessed to hide it from the mixing surface dur-
ing normal operation.
Input Polarity
The polarity (sometimes referred to as a phase inversion) of inputs 2 and 4 can be reversed. Polarity
reversal is used to compensate for incorrectly wired balanced cables, to prevent signal cancellation
when a source is dual-miked from opposite directions, or to reverse left/right with MS microphones.
To toggle between normal and reverse polarity, activate the respective input’s PFL then press the
Battery Check Button. When the front panel Input Polarity LED is lit, the polarity is reversed on that
channel.
1) Hold the Input’s PFL. 2) Press the Battery Check Button.