ART MPA Gold™ Microphone Preamplifier
10
MPA GOLD OPERATING INSTRUCTIONS
Obtaining the best noise performance with the MPA GOLD
Start by turning down the Input Gain knob and centering the Analog Output knob. Use
the analog meter to view the operating level by depressing the switch under the center
of the analog meter. The meter will now indicate how much tube headroom there is. Set
the +20dB switch to the out position.
Increase the Input Level knob until the meter reads above –15dB. If you have turned the
input knob fully clockwise and the indicated level is still below –15dB on the meter,
center the input knob and depress the Gain switch. Increase the Input Gain until there is
sufficient level.
This procedure optimizes the gain elements to provide the widest dynamic range
possible.
Adjusting the Input Impedance
The same microphone can sound different on various pre-amps. One reason is that
every pre-amp presents a different load on its input, some even change as gain is
changed! Our third generation discrete front end was designed to be absolutely
transparent. Every nuance of the microphone is maintained providing detail masked by
inferior pre-amps. The Input Impedance control is one key element in providing new
versatility in voicing microphones.
NOTE: the Input impedance control only affects the cannon connector inputs. The ¼”
instrument input on the front panel is NOT affected by this control in any way. The
instrument input impedance is ALWAYS >
1M Ohm.
Dynamic microphones are affected as much as phantom powered units.
We provide a continuously variable impedance control to allow you to fine-tune the
voicing, finding the perfect interaction between microphone and pre-amp.
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