Arrakis Systems MARC-15, Техническое руководство, Страница: 58 / 82

I N S T A L L A T I O N I N S T R U C T I O N S
4.30
13.3 Transformer Balanced Output to Balanced Console Input
Transformer sources require a fixed impedance for proper performance. The console input impedance
is high compared to the impedance of most transformers and will require a resistor to match the trans-
former.
(+)
(-)
(+)
(-)
TRANSFORMER BALANCED
AUDIO SOURCE
CONSOLE
INPUT
CHASSIS
GROUND
SHIELD
13.4 Microphone to Balanced Console Input
The input impedance of microphone preamps is high compared to the characteristic imped-
ance of many microphones. Most microphones do not require impedance matching. Refer to
the microphone spec sheet to determine if impedance matching is recommended. If required,
the resistor should be added as illustrated below.
Stereo microphones will require an outboard stereo mic preamp and then be brought in
to the console on a stereo line input channel.
IMPORTANT- High voltage static discharges to the mic case can ruin a mic preamp’s input
stage. Room carpets and surfaces should be chosen for low static or treated to reduce static.
(+)
(-)
(+)
(-)
MICROPHONE CONSOLE
INPUT
CASE
GROUND
SHIELD
SHIELD GND
Zin > 10k
ohms
150 ohm typical
matching resistor
Zin > 1k
ohm
600 ohm
matching resistor