User manual

4.2 Input Section
The channel can operate in either microphone or line
input mode. The microphone input is a electronic
balanced, transformerless design. The input-impedance is
greater than 2 Kohms, which will not cause any loading
effects on todays studio microphones. The line input;
which can be used or effect returns, digital recorder
playback, CD players, or any line level device, has an
input impedance greater than 0 Kohms, which is high
enough to interface with all available peripheral
equipment.
4.2.a. +48v
The +48 Volt switch routes power to condenser
microphones, Direct injection boxes, or any device
requiring "phantom power". When using dynamic microphones
or any other equipment not requiring phantom power, the
phantom power switch should be in the off or up position.
4.2.b. pad
Pushing the pad switch inserts 20dB of attenuation into the
input of the microphone amp. This could be necessary when
modern condenser microphones are used in close proximity to
musical instruments. Even direct injection boxes are
capable of providing high level signals. The pad switch
also raises the input impedance, providing a balanced line
input when needed.
NOTE: With special orders, we can increase the pad to 30dB
and the impedance as well, to provide for balanced,
switched mic/line inputs.
4.2.c. gain
The microphone input gain can be varied between 20dB and
55dB of gain. The 20dB pad increases the control range to
55dB. Thee line input gain can be varied between -20dB
and +20db. One control varies both sets of electronics.
Both the mic and line inputs have their own input
connectors. The mic input is balanced on an XLR type
connector. The line input on a mono jack connector. The
line/group switch must be in the down position to activate
the line input thus turning off the microphone input.
4.2.d. phase
The phase reverse switch reverses the wiring of the mic
input only. In most cases it is the mic signal that's out
of phase with another microphone.
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