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strong electro-magnetic fields, such as power transformers, motors, or RF
transmitters. Similarly, do not place this unit on any surface that is hot to
the touch or where it can become overheated.
Before turning on the power, all connections to this unit should be made
and the Gain controls (ref. #10 and #11) set at their minimum (fully
counterclockwise) settings. Also before powering up this unit, be sure
that the RPQ500 module is properly seated within its rack or console,
and that the next item in the signal chain is turned down to prevent any
sudden loud noises from damaging your system or hearing.
Input Connections
The RPQ500 can be operated either as a mic preamp with the optional
EQ/filter, or as a standalone EQ/filter and fader for line level signals. The
default mode is the Microphone Input Mode with the Line/Mic switch
(ref. #8) in the OUT position. Depressing the Line/Mic switch bypasses
the first gain stage and routes the signal from the XLR input connector
straight to the optional CurveShaper
circuitry and the Output Gain
TM
control (ref. #11). The Line Input Mode is indicated by the illuminated
green LED above the Line/Mic switch.
Microphone Input Mode
With ribbon microphones, moving-coil dynamic microphones, and any
other microphones that do not use phantom power it is recommended
that the Phantom Power switch (ref. #7) is set to the OUT/OFF position
before and while they are connected, to prevent possible damage to the
microphones. The LED above the Phantom Power switch will be lit in red
when P48 Phantom Power is engaged.
The input impedance of the input is 10 kΩ, which means that the pre-
amp does not load down a microphone connected to its input. This is
particularly beneficial when using ribbon microphones, because they are
sensitive to low preamp input impedances. A higher input impedance will
generally yield higher bandwidth and higher output sensitivity.
To prevent damaging the equipment in your system, it is a good idea to
test your microphone cables regularly to determine whether they have
any open, shorted, reversed, or intermittent connections.
Defective
1
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