Revision C • 12/05
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MX
d uses a minimum of controls, lighted buttons and meter
displays to simplify mixer operation. Each of the two models:
rack-mount and desktop, offers identical functionality but with
different physical controls, as identified in this section.
For those used to working on larger Harris or PR&E mix-
ers and consoles, the SMX
d’s major difference is that each
channel has only one button for On and Off control. When the
On/Off button LEDs are lit, the channel is on. When the On/
Off button LEDs are not lit, the channel is off.
The small Cue, Talk, Bus Assignment, and Monitor Source
Select buttons also light to indicate their selected status. To
assign a channel to a bus, press the bus assignment button to
turn on its LED. Each channel can be assigned to any combi-
nation of Program 1 (PGM 1) and Program 2 (PGM 2).
Three Monitor Source Select buttons select and indicate the
source feeding the meters, room monitor output and talent
headphones output. Only one button will be lit, although Cue,
when active on any channel, overrides the selection—turning
off the active button’s LED. The active Cue buttons wink to
indicate Cue is active. Turning all Cue buttons off returns the
monitor source to its previous selection. Alternately, to force
all Cue buttons off, press any monitor select button to assign
it as the new monitor source.
Both SMXd versions feature an unbalanced -10 dBv stereo
input TRS jack next to the meters (the Tip is the left channel,
the Ring is the right channel). It connects to Channel 4 along
with the rear panel channel 4 input. When both inputs are
active, the two signals are summed together.
Microphone Channels
Channel 1 is typically set as the Talent Mic. When On, the
room monitor output is muted and a “hot mic” warning com-
mand is activated. Pressing the Channel 1 Talk button routes
the mic audio (pre-fader and pre-switch) to the talk output
and to the mix-minus output. This action also mutes the room
monitor output, but it does not activate a warning command.
When Channels 2 and/or 3 are also set as mic inputs they
mute the room monitor output and generate a warning com-
mand when On. Their Cue button function also changes to
momentary operation and, while pressed, will mute the room
monitor output, without activating a warning command.
Note that only the Channel 1 mic can talk to the Mix-Mi-
nus signal and to the Talk output using the Channel 1 Talk
button. Channels 2 and/or 3 can talk to the Mix-Minus out-
put if they are assigned to the Mix-Minus bus and are turned
On with their fader up.
Telco Channel
Any one channel can be assigned as the Telco channel. This
means the channel’s input comes from a phone hybrid, ISDN,
or other two-way device that requires a return feed (the Mix-
Minus output, which is one bus minus the Telco channel au-
dio). The Mix-Minus output can be either the PGM 1 or PGM
2 bus. The bus feeding the Mix-Minus output is indicated by
winking the bus assignment button on the Telco channel.
Overview of the Controls and Features
on the Desktop model
Stereo Bargraph Meter
TRS Input jack
for Input 4
Room Monitor & Talent
Headphones level
controls
Channel controls (x7)
with Bus assign and Cue
or Talk buttons, level
control & removable
On/Off button lens
Talent Headphones Jack
Mixer Operation
