Sound Devices 552 - Manual (Page 19)

552 User Guide and Technical Information
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1) Hold the Input’s PFL. 2) Slide the SLATE MIC/TONE switch left.
Phantom Power
Phantom powering is a fixed DC voltage of either 12 or 48 Volts. This voltage is resistively applied to
pin 2 and pin 3 of an input’s XLR connector, relative to pin 1. In this configuration, there is no volt-
age difference between signal pins 2 and pin 3.
The phantom voltage is selectable between 12 and 48 Volts in the Setup Menu. The selected voltage
level applies to all inputs with phantom power enabled. Phantom power voltage is 48V at factory
default. See Setup Menu.
Phantom power can be activated individually for each input. To enable or disable phantom pow-
er, press and hold the respective input’s PFL switch then momentarily slide the Slate Mic/Tone
switch to the Tone position. The respective input’s PH LED illuminates when phantom is enabled.
1) Hold the Input’s PFL. 2) Slide the SLATE MIC/TONE switch right.
Phantom power is only applied to inputs set for Mic level at factory default. Phantom Power can be
applied to inputs set to Line- and Mic-Level in the Setup Menu. This is useful when using micro-
phones in high SPL environments.
Make certain to disable phantom power with Line-level output devices that are susceptible to damage
from DC.
The 552 can provide up to 10 mA to each input at 48 V, sufficient for the most power-hungry con-
denser microphones. Many phantom powered microphones do not require 48 V and can be properly
powered with 12 V. When acceptable, use 12 V phantom to extend the 552’s battery life.
If Phantom Power is not required, for instance with dynamic microphones, it is best practice to dis-
able it. Phantom power can capacitively couple noise into the mic inputs with poor mic cables. When