User guide

664 User Guide and Technical Information

Input Linking

Input pairs 1-2, 3-4, and 5-6 can be linked as stereo pairs. 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 ﬁ ltering for their respective inputs.

• The odd channel’s Input Fader controls the post-fade level of both inputs.

• The odd channel’s Pan Control controls the balance of the stereo signal to the Master Bus.

• 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 conﬁ guration, 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 con-

nects to the odd Input, and the bidirectional microphone is the “side” signal and connects to even In-

put. The cardioid microphone is pointed at the sound source, and the bidirectional microphone is ori-

ented sideways (positioned with its capsule as near as possible to the cardioid microphone’s capsule).

The following diagram shows the relative polar pa erns of microphones in an M/S conﬁ guration.

Mid Signal

Side Signal

Digital Inputs

The 664 accepts AES3 (AES/EBU) balanced, AES42 (digital microphone) balanced, and AES3id unbal-

anced digital signals on the Input 1 and Input 6 XLR 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 a ach unbalanced connections to an input set for AES42. This can result in damage to the hardware.