Aphex 1788A Premium Eight Chan Mic Pre - Manual (Page 43)

Page 42
MICROPHONE PREAMPLIFIER
Page 43
Instruction Manual
APPENDIX D
PART 2: BALANCED OUT to UNBALANCED IN
It was mentioned that there are several types of
balanced output stages in use today. The follow-
ing diagrams show you how to properly unbal-
ance each type of output. If you follow these
instructions, you should have no problems.
SIMPLIFIED SCHEMATIC
Transformer Balanced Outputs
Mono Phone Plug
Female XLR
Servo Balanced Outputs
Mono Phone Plug
Female XLR
SIMPLIFIED SCHEMATIC
Voltage Balanced Outputs
Mono Phone Plug
Female XLR
SIMPLIFIED SCHEMATIC
Don’t Ground or Connect Pin 3
Ground Pin 3 Directly to Pin 1.
Alternatively, Carry Pin 3 Through Twisted Pair Cable
and Ground at Other End
Ground Pin 3 Directly to Pin 1
Do Not Carry Pin 3 Through Cable and Ground
at Other End
Impedance Balanced Outputs
Female XLR
SIMPLIFIED SCHEMATIC
Pin 3 Doesn’t Matter
OK Grounded or Not Grounded
Unbalancing loses half the output level.
You lose 6dB of gain.
Unbalancing loses no output level.
You retain full gain.
Unbalancing loses no output level.
You retain full gain.
Unbalancing loses no output level.
You retain full gain.
Mono Phone Plug