USINGTHEMLC8B
The MLC8B is designed to display the levels of multiple audio signals in a surround
sound environment (5.1 + 2) and to provide acoustic mixing of these signals with an
overall global level control. Every effort has been made to make using the MLC8B as
intuitiveaspossible.
All connections to the unit are made on the rear panel and all displays and operating
controlsarelocatedonthefrontpanel.
The MLC8B accepts AES, 110 Ohm, balanced audio signals, analog audio signals or
AES audio signals embedded in a 3G, HD or SD SDI video stream. The operator must
switch the input selector to the type of signal being controlled. To select the Group 3
and Group 4 signals from the SDI data stream for disembedding, the button labelled GR
3/4mustbeselected.
The push buttons labelled AES, ANALOG, SDI 1, SDI 2 and GR 3/4 in the cluster of
five LED illuminated push buttons on the righthand side allows the operator to select
the input signal source. The LED in the push button will illuminate to show the selection
that had been made. Please note that a mix of signal types can not be controlled
simultaneously.
When the sixth button in the cluster, labelled ST MODE, is pushed inputs one through
six (AES 1, 2 and 3) and (Analog 1, 2, and 3) are disconnected the seventh and eighth
channels (AES4) and (Analog4) are switched to the inputs 1 and 2 controls. This allows
the operator to listen to the ST L and ST R on the L and R monitor speakers. In the ST
MODEtheC,LFE,LSandRScontrolsaredisabled.
Eight bargraph displays on the lefthand side show the level of the incoming signal. The
factory setting for the bargraph meters is 20dBFS = 0. Field calibration of the meter for
othernominallevelsisachievedbyusingDIPswitches3and4ontherearpanel.
SW3 SW4 NOMINAL
Down Down 20dBFS
Down Up 18dBFS
Up Down 16dBFS
Up Up 12dBFS
The eight rotary level controls labelled L, R, C, LFE, LS, RS, ST L and ST R are used
to adjust the level of the individual signals being fed to the output of the MLC8B. These
rotary controls are equipped with concentric array of LED indicators that show the
proportionate value of the signal. Each rotary control incorporates a pushpush switch
that instantly mutes that signal. When muted the concentric LEDs extinguish except for
