CONTENTS
INTRODUCTION ......................................................................................................................................... 3
WHY CLASS-A?............................................................................................................................................ 4
WHY TUBES? ................................................................................................................................................ 4
WHY BALANCED I/O?..................................................................................................................................5
BLOCK DIAGRAM...................................................................................................................................... 6
PRECAUTIONS ............................................................................................................................................7
INSTALLATION........................................................................................................................................... 8
AC Mains Supply. .................................................................................................................................... 8
Mic Input. ................................................................................................................................................. 8
Line Input. ................................................................................................................................................ 9
Instrument Inputs..................................................................................................................................... 9
Insertion Point. ........................................................................................................................................ 9
Output..................................................................................................................................................... 10
Ventilation..............................................................................................................................................10
OPERATION ............................................................................................................................................... 11
Input Stage. ............................................................................................................................................11
Microphone Input. .................................................................................................................................11
Line Input. ..............................................................................................................................................11
Instrument Input. ...................................................................................................................................11
30dB Pad................................................................................................................................................ 12
90Hz Filter............................................................................................................................................. 12
Phantom Power. .................................................................................................................................... 12
Tube Stage Drive and Peak LEDs........................................................................................................12
WHAT IS COMPRESSION? ...........................................................................................................................12
Overview of Compressor Operation. ................................................................................................... 13
Threshold. ..............................................................................................................................................13
Attack and Release. ...............................................................................................................................14
Gain Make Up. ......................................................................................................................................15
Compressor On......................................................................................................................................15
Equalisation. .......................................................................................................................................... 15
LF Band.................................................................................................................................................. 16
Mid Band................................................................................................................................................ 16
HF Band. ................................................................................................................................................16
EQ On.....................................................................................................................................................16
EQ Pre.................................................................................................................................................... 16
Output Gain. .......................................................................................................................................... 16
Digital Output........................................................................................................................................17
Output Peak LED. .................................................................................................................................17
GETTING STARTED ................................................................................................................................18
CONNECTIONS. ...........................................................................................................................................18
IN USE ......................................................................................................................................................... 19
SPECIFICATION .......................................................................................................................................21
Mic Input:...............................................................................................................................................21
Line Input:.............................................................................................................................................. 21
Instrument Input: ...................................................................................................................................21
High Pass Filter: ...................................................................................................................................21
Insertion Point:......................................................................................................................................22
Output: ................................................................................................................................................... 22
Tube Stage: ............................................................................................................................................22
Compressor: .......................................................................................................................................... 22
Equaliser:............................................................................................................................................... 22