User Guide

III
IMPORTANT SAFETY INSTRUCTIONS – READ FIRST ......................................................... II
PRO MPA II OVERVIEW – FEATURES AND GENERAL INFORMATION:............................ 1
FRONT PANEL CONNECTIONS AND CONTROLS ................................................................ 3
Input Gain control ..................................................................................................................................... 3
Input Impedance control ...........................................................................................................................4
Low Cut Filter control................................................................................................................................4
Gain switch ............................................................................................................................................... 4
Phantom switch ........................................................................................................................................5
Phase switch............................................................................................................................................. 5
Plate Voltage switch ................................................................................................................................. 5
Mid/Side Matrix switch .............................................................................................................................. 6
Analog Output control ............................................................................................................................... 6
STEREO/Dual switch................................................................................................................................ 6
+4/-10 switch (rear panel)......................................................................................................................... 7
Meter Trim ................................................................................................................................................ 7
Front Panel connections .........................................................................................................7
Instrument Inputs ...................................................................................................................................... 7
Rear Panel connections ..........................................................................................................8
Balanced Inputs ........................................................................................................................................ 8
Balanced Outputs .....................................................................................................................................8
PRO MPA II OPERATING INSTRUCTIONS ............................................................................ 9
Obtaining the best noise performance with the PRO MPA II.................................................................... 9
Adjusting the Input Impedance .................................................................................................................9
Setting the Tube Plate Voltage ............................................................................................................... 10
Using the Mid/Side mode........................................................................................................................ 11
WARRANTY INFORMATION.................................................................................................. 12
Limited Warranty..................................................................................................................................... 12
Exclusions............................................................................................................................................... 12
SERVICE ................................................................................................................................. 13
PRO MPA II SPECIFICATIONS ............................................................................................. 14
List of Figures
Figure 1 – Block Diagram .......................................................................................................... 2
Figure 2 – Front controls............................................................................................................ 3
Figure 3 – Rear connections ...................................................................................................... 8
Figure 4 – Mid/Side Mic alignment........................................................................................... 11