Sound Devices 633 - Manual (Page 24)

Polarity reversal is used to compensate for incorrectly wired balanced cables, to prevent signal can-
cellation when a source is dual-miked from opposite directions, or to reverse left/right with micro-
phones in a mid-side (M/S) configuration.
Input Linking
Input pairs 1-2 and 5-6 can be linked as stereo pairs. Inputs can be linked as a standard stereo pair or
as an M/S matrixed stereo pair ( See “M/S Matrixing”, page 18 ).
When a pair of inputs is linked:
• Each channels’ Trim Control and High-Pass Filter Control work as normal, controlling coarse gain
and High-pass Filtering for their respective inputs.
• The odd channel’s Input Fader controls the post-fader level of both inputs.
• The odd channel’s Pan Control controls the balance of the stereo signal to the Master Bus. When
linked M/S, the odd channel’s Pan Control functions as a left/right balance control for the matrixed
M/S signal.
• The even channel’s Fader Control and Pan Control are disabled.
• The limiters of both inputs are linked.
• The background label of both inputs is connected on the Main Screen.
Linked
Unlinked
M/S Matrixing
When input pairs are linked M/S, the odd channel is used for the Mid signal and the even channel is
used for the Side signal. To produce a stereo signal from an M/S configuration, the signal from both
microphones must be processed.
Mid-side (M/S) matrixing is a method for processing audio signal from a cardioid microphone and
a bidirectional microphone into a stereo signal. The cardioid microphone is the “mid” signal and
connects to the odd Input, and the bidirectional microphone is the “side” signal and connects to even
Input. The cardioid microphone is pointed at the sound source, and the bidirectional microphone
is oriented sideways (positioned with its capsule as near as possible to the cardioid microphone’s
capsule). The following diagram shows the relative polar patterns of microphones in an M/S con-
figuration.
Mid Signal
Side Signal
633 User Guide and Technical Information
18
v. 1.02 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
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