70V 40W Digital Mini Amplifier
OWI Incorporated 5 www.owi-inc.com
Figure 4 Audio Output Connection
3.3.2 Audio Inputs
AMPMA70V40 provides with 2 stereo audio inputs, one microphone input and one
digital fiber audio input. The following figure shows the audio input ports.
Figure 5 Audio Input Ports
48V phantom power input
When th
e switch turns to “48V” (It has a good frequency characteristic, high input
impedance and high sensitivity in this mode), the MIC input will provide a 48V phantom
power. This is usually used for power supply for condenser microphone, Connection is:
“+” connects to positive, “-” connects to negative and “
” to ground.
Note
: In this mode, only condenser microphone can be connected with.
MIC input
When the switch turns
to “MIC” (It has a low frequency characteristics, and wide
frequency response in this mode), the microphone input is used for connecting with
dynamic microphone. There are two different connections:
a)
Unbalanced connection:
“+” and “
” connect to ground, and “-” connects to signal.
Dial Switch, to select the MIC input mode,
includes MIC (dynamic microphone), 48V
(condenser microphone) and LINE (normal
audio or wireless microphone).