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The next step is to configure the many rear panel switches for your applications.
Although the unit is shipped from the factory with default switch values‚ you should
make sure that these settings are correct for your application. Let’s take a look at
each one and describe how it works.
First there are the Channels 1–6 Bus Assign Switches (See Figure 10). These
switches provide the ability to assign each input to the Left‚ Right or Aux output
buses. In addition‚ you can turn on or off the phantom power on each channel. There
is a single 8-position DIP switch for each TWO input channels. Take care you are
adjusting the correct switch for each channel. It is recommended that you use a
small screwdriver or other instrument to set the switches. Do not force the switches.
Also‚ keep in mind that the ON position is UP. Figure 10 shows the DIP switches with
all functions in the ON position. Note: The factory setting is all bus assign switches
ON and phantom OFF.
Figure 10.
Input Channel Bus Assign Switches and
Input Connectors
Figure 11.
Mic Mix‚ Rt Out Mute and Low
Cut Switches
Figure 12.
Channel 7 & 8 Mode Switches
Figure 13.
EQ and Bus Link Switches
In approximately the middle of the rear panel‚ you will find a group of three switches. They
include the Mic Mix‚ Rt Out Mute and Low Cut switches (Figure 11). The Mic Mix switch allows
the summed signal of Channels 1–6 to be routed before or after the remote Left/Right volume
control. In the Pre Remote position‚ the signals from Channels 1–6 are affected by the remote
volume control along with the stereo input from either Channel 7 or 8. In the Post Remote
position‚ only the stereo input from either Channel 7 or 8 is affected by the remote volume
control. The factory default setting is Pre Remote.
The Rt Out Mute switch controls the muting of the right bus mix. The factory setting of this
switch is Enable. When enabled‚ the Left and Right mix buses are affected by the activity of the
Channel 1 muting circuit. When this switch is defeated‚ only the Left bus is affected by the
muting circuit. Use the Channel 1 Mute Threshold control to set the trigger point to activate the
muting.
The Low Cut switch enables a filter with a corner frequency of 100 Hz and is helpful to filter out
rumble‚ wind noise‚ breath thumps and other low-frequency signals that rob amplifier power
and muddy the mix. Enabling this switch will affect Channels 1–6 only. The factory default
setting for the Low Cut switch is Defeat or Flat.
The Mode switch (Figure 12) selects either Stereo mode or Mono mode for Channel 7 or 8.
In the Stereo mode‚ the Left input signal feeds the Left mix bus and the Right input signal
feeds the Right mix bus via the front panel Level control. In the Mono mode‚ the summed
Left and Right input signals feed Left and Right mix buses. This allows for a mono source
to be used to feed the stereo mix buses. Additionally‚ it allows for Left and Right outputs
of the source to be summed without a Y-cable. In either mode‚ a summed mono signal
feeds the Aux mix bus. The factory default is Stereo.
The EQ switch (Figure 13) places the 4-band stereo equalizer in or out of the Left and
Right signal paths. In the OUT position the equalizer is completely bypassed. The
factory default is IN. The Bus Link switch is used to place the mixer in the master or
slave mode of operation. A stand-alone unit should always be in the master mode
and the factory default is Master. See the Connections section of this manual for
details on Bus Linking and using multiple units.
That completes the configuration. As you can see‚ the SMR™821a provides many
powerful features for better‚ more cost-effective systems. The multiple combinations
of routing‚ control and input assignment facilitate a wide range of applications.