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Jumper Options
Changing Jumper Settings
To change a jumper setting, remove the ten screws secured to the top of the mixer. After
removing the top of the mixer, locate the jumper to be changed by referring to the drawing
on page 18. Jumpers are included from the factory in positions: J2, J17, J18, J21, and J22.
Warning: Disconnect AC Power before opening case.
Bar Graph Options
The mixer’s meter can be configured to meter the output of either the main or auxiliary bus.
In addition,the bar graph can be configured to register either the peak or average level of the
audio signal.
J22-J23
The LED Bar Graph Output Meter can be set to register either the main or auxiliary bus
output audio signal. The choices are:
J22 installed:The Bar Graph meters the main bus output. This is the factory default.
J23 installed:The Bar Graph meters the auxiliary bus output.
Note: The meter will operate only when a jumper is in one of these two positions.
J20-J21
The LED Bar Graph Output Meter can be set to register either the peak or average level
of the output audio signal.The choices are:
J20 installed:The Bar Graph meter registers the peak level of the audio output.
J21 installed:The Bar Graph registers the average level of the audio output. This is the
factory default.
Note:The meter will operate only when a jumper is in one of these two positions.
Bus Routing Options
AUX In Jumpers: J17 and J18. These jumpers determine the destination of the Auxiliary
Input.The choices are:
J17 installed:Auxiliary Input is routed to Main Output.
J18 installed:Auxiliary Input is routed to Auxiliary Output.
J17 and J18 both installed:Auxiliary Input is routed to both Main and AUX outputs.This is the
factory default setting.
AUX Source Jumpers:J1 and J2.These jumpers determine which of two gain controls are
used to control the level of the AUX output.The choices are:
J1 installed:AUX output gain is controlled by the internal pot,“AUX Pregain Pot” RP23 (see
page 18 for location).The front panel AUX output volume knob continues to independently
control the gain of the headphone amplifier jack on the front panel.This setting is typically
used in a linking situation where the output from a mixer must remain fixed, since J1 makes
the output of that mixer tamper-proof (from the front panel).With J1 installed,the front panel
AUX volume knob controls only the headphone level.
J2 installed:AUX output gain is controlled by AUX volume knob on front panel.The 1/4-inch
Headphone amp is also controlled by the AUX volume knob, but not independently of the
AUX output.
Note: Never install jumpers in both positions J1 and J2.If both J1 and J2 jumpers are installed,
then gain is defeated.
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