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ART MPA Gold™ Microphone Preamplifier
Both the microphone and instrument inputs are optimized for their respective sources as
far as signal levels and noise performance. Running most of the gain on the input
generally provides the best performance of the MPA Gold. Refer to the section titled
"Obtaining the best noise performance with the MPA Gold" for more detailed
instructions on setting the Input Gain control for the best results.
Input Impedance control
This knob controls the Mic/line input amplifier impedance. This function allows variable
voicing of any microphone.
Refer to the application section titled "Adjusting the Input Impedance" for more
information on making the most of this function.
The ¼" instrument input is NOT affected by this control, and remains high (>1M Ohm)
impedance.
Analog Output control
The output signal level at the rear output jacks is adjusted by this control. It can provide
from +10dB of gain (fully clockwise) to completely muted. You can see the effects of this
adjustment reflected in the analog meters when the meter switch is set to "output".
HPF control
The HPF is a single tuned High Pass Filter that is frequency tunable. The input signal
can be filtered to remove "pops" or other extraneous low frequency information. This
control moves the rolloff frequency from 10 Hz (fully CCW) to 200 Hz (fully CW). Since
it is single tuned, it preserves some low frequency content so its use is less obtrusive. It
is especially useful in close mic'd applications.
Gain switch
The Gain switch is used in conjunction with the input gain control to adjust signal levels
through the MPA Gold. When depressed, the tube circuit provides 20dB more gain in
the signal path. This also has the effect of driving the tube harder and making the tube
the dominant source of gain and overload character.
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