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Installation Tips
Inputs and outputs
Balanced (XLR) audio interconnects will provide better noise immunity, and are best suited to long
cable runs or noisy environments. Be sure to select the correct input for
each
channel using the
appropriate rear panel switches.
Rack mounting
The PA 2-250 is quite heavy. Locate the PA 2-250 on racks, stands, or shelves rated to support at
least 100 pounds. We recommend using the (optional) Sherbourn rack mount adapters.
Ventilation and cooling
Even though the PA 2-250 is very efficient, it can produce significant heat; to avoid overheating, be
sure to provide adequate clearance and ventilation. Overheating adversely affects performance and
shortens component life. We suggest locating components that produce the most heat towards the
top of your rack, if practical, and leaving at least 1U (1.75”) of rack space between components.
Space between components can be left open for ventilation, filled with a spacer, or used to house a
forced-air cooling solution.
Sherbourn’s C-12 Flex Rack™ Cooling System uses whisper quiet, high capacity, variable speed
fans to provide over 100 CFM of forced air cooling for rack installations. The C-12 offers a variety of
air-flow options (including external ducting), includes professional features like triggered operation
and thermostatic control, and takes up only 2U of rack space.
AC power source
The PA 2-250 uses an IEC C17/C18 type power cord and requires an appropriate
matching AC outlet.
Connections
Ensure that the amplifier is powered Off when connecting and disconnecting speakers.
Ensure that speaker cables are not shorted to each other or to adjacent wiring before powering the
PA 2-250 on.
Triggers
When the PA 2-250 is in Standby mode (On/Off LED is lit red), asserting a trigger signal turns the
PA 2-250 on, and it remains on until the trigger is no longer asserted. If the trigger signal is already
active when mains power is applied, the PA 2-250 will switch on as soon as it completes self-test,
and will switch to Standby when the trigger is no longer asserted.
If the front panel On/Off switch is pressed while the PA 2-250 is on (after being switched on by an
asserted trigger), the On/Off switch will override the trigger and the PA 2-250 will return to Standby
position (even though the trigger is still being asserted). Pressing the front panel On/Off button,
dropping and re-asserting the trigger, or switching the mains power off and on again while the trigger
remains asserted, will then switch the PA 2-250 back to on.
