Art DIGITAL MPA II [17/24] Digital mpa ii operating instructions

DIGITAL MPA II OPERATING INSTRUCTIONS

Obtaining the best noise performance with the DIGITAL MPA II

Start by turning down the Input Gain knob and centering the Analog Output knob. Set the +20dB

switch , Plate Voltage

switch and the Stereo/ Dual mode switch in the "out" position. The analog VU

meter will now indicate how much tube headroom there is.

Increase the Input Level knob until the analog VU meter reads above –10dB.

If you have turned the input knob fully clockwise and the indicated level is still below –10dB 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 to 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.