SUB MONO
When the
SUB Mono
indicator light is illuminated, the sub-low frequencies of the left and right chan-
nels in the processor are electronically mixed together and then fed to the
SUB
outputs. Thus both
the left and right
SUB
outputs carry a mono mix of the sub-low frequencies.
4.2.4 Gain switches
Each output of the MX8700 has a pair of
GAIN
dip switches that MUST be programmed to match the
power amplifier’s voltage gain in dB. The MX8700 uses the gain setting to determine threshold for limit-
ing each output. Essentially, this is equivalent to electronically sampling the amplifier’s output.
Normally the amplifier’s gain is when its input level control is set to maximum, usually meaning fully clock-
wise. One of four different gain settings can be programmed for each of the eight outputs. The graphic
at the top of the front panel decal shows the available settings for these switches.
When setting the gain switches, you may have to approximate the gain setting of the processor versus the
actual gain of the amplifier. For compression drivers, pick the lower of the gain values nearest the actual
gain. For cone drivers, pick the higher gain nearest the actual gain. For example suppose your amplifier
has a gain of 37 dB gain. The gain switches allow 32 dB or 38 dB gain. If the load is a compression driv-
er, pick 32 dB gain. If the load is a cone speaker, pick 38 dB gain.
4.2.5 Mute Switches
Each output channel has a
MUTE
switch and a mute LED. The
MUTE
switch mutes that output and the
MUTE
LED glows red when that output has been muted.
4.2.6 Signal Indicators
Each output channel has a
sig
LED. This LED glows green for any signal at that output. If the output
level exceeds the limiting threshold, it glows red at the limit threshold.
Note: the
sig
LEDs will indicate
this threshold even when the limiters are bypassed.
Occasional flashing is OK. However, if the
sig
LED
is rapidly flashing red or a steady red a large percentage of the time, the system is exceeding its capabil-
ity and the volume should be reduced.
4.3
Rear Panel Controls and Connectors
4.3.1 Balanced Inputs
Each of the two XLR-F connectors is a transformerless balanced input designed to accept line level signals.
4.3.2 Channel Outputs
Each of the eight XLR-M connectors is a transformerless balanced output designed to deliver line level signals.
4.3.3 Power Switch
This switch turns the MX8700 on or off. The outputs are temporarily muted during turn on to protect the
loudspeaker from turn-on transients.
4.3.4 IEC 230 connector
The male IEC connector accepts a standard IEC female connector. Ensure that the MX8700’s voltage rat-
ing (see rear panel markings) matches your local mains voltage.
4.3.5 RS232 connector
The DB9-F connector is for connection to a COM port on a computer. This connector is for downloading
preset information from a computer running EAW’s MXLoader program.
Page 4
Summary of Contents for MX8700
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