Tuning Response Document# 154763
April 2016
2
Table of Contents
Microphone Circuits ...................................................................................................................................... 4
Microphone Selection ................................................................................................................................... 4
Digital vs. Analog Microphones ................................................................................................................ 4
Digital Microphones .................................................................................................................................. 5
Digital Microphone Selection ................................................................................................................ 5
Recommended Digital Microphones .................................................................................................... 5
Example Schematic ............................................................................................................................... 6
Example Schematic Notes ................................................................................................................. 6
Analog Microphones ................................................................................................................................. 7
Analog Microphone Selection ............................................................................................................... 7
Omni versus Uni-Directional Microphones ........................................................................................... 7
Analog Microphones Schematic ............................................................................................................... 8
Example Schematic – Short Cable ......................................................................................................... 8
Example Schematic Notes ................................................................................................................. 9
Example Schematic – External Long Cable .......................................................................................... 10
Example Schematic Notes ............................................................................................................... 10
Speaker Selection ........................................................................................................................................ 12
Speaker Loudness ................................................................................................................................... 12
Speaker Selection .................................................................................................................................... 13
Speaker Selection Example 1 .............................................................................................................. 14
Speaker Selection Example 2 .............................................................................................................. 15
Speaker Circuits........................................................................................................................................... 16
Speaker Circuits Options ......................................................................................................................... 16
Example Schematic A – Direct Differential ......................................................................................... 17
Example Schematic Notes ............................................................................................................... 17
Example Schematic B – Direct Differential Class D Amplifier ............................................................. 18
Example Schematic Notes ............................................................................................................... 18
Selecting a Speaker Amplifier ............................................................................................................. 19
Dynamic Speaker Gain .................................................................................................................... 20
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