Owner's manual

• 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.

Input Setup & Control