Sound Devices 664 - Manual (Page 18)

• The odd channel’s Pan Control controls the balance of the stereo signal to the Master Bus. When
linked MS, the odd channel’s Pan Control functions as a left/right balance control for the matrixed
MS 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 MS, 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 (MS) 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
Digital Inputs
The 664 accepts AES3 (AES/EBU) balanced, AES42 (Mode 1) balanced, and AES3id unbalanced digi-
tal signals on the Input 1 and Input 6 XLR-3F connectors. The 664 auto-detects between AES3 and
AES3id digital signals and adjust accordingly. Digital input gain is controlled from the front panel
faders.
Never attach unbalanced connections to an input set for AES42. This can result in damage to the hard-
ware.
To use a digital input, slide the Input 1 or Input 6 Input Selector Switch to the right to enter the Input
Settings Screen. Press the Headphone Encoder to display the list of available input sources. Turn
the Headphone Encoder to select AES3 or AES42, and press the Headphone Encoder to confirm the
selection.
664 User Guide and Technical Information
v. 2.02 Features and specifications are subject to change. Visit www.sounddevices.com for the latest documentation.
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