Control Elements - Alto APM10 User Manual

4. CONTROL ELEMENTS

Mono and Stereo Input Channels
1 The MONO MIC/LINE Channels
Your APM120 is equipped with 8 (12 for APM160) low-noise microphone
preamplifiers with optional phantom power, 45 dB of Gain and over 115 dB of S/N
ratio. You can connect almost any type of microphone. Dynamic microphones do
not need phantom power. Use phantom power only with condenser microphones
but make sure that the phantom power button is disengaged before connecting
the microphone. Phantom power will not damage your dynamic microphones, so
make sure to read the microphone instructions manual before engaging phantom
power. Use switch (4) to activate/deactivate phantom power. These channels
are also equipped with 1/4" TRS balanced/unbalanced LINE-IN plugs to connect
line-level instruments such as keyboards, drum machines and effect devices.
2 MONO Channel INSERT
This is where you connect external sound processors
such as compressor-limiter, equalizers, etc. The insert
point is available on the first 8 MIC (12 for APM120)
channels only. For the other channels you can always
insert the processor in between the sound source
(such as keyboard or drum machine) and the APM input.
The Insert sockets can be used as direct-outs to feed
the input of a 4-track tape recorder.
3 STEREO INPUTS
These are Channel 9/10 and 11/12 (Channel13/14 and
15/16 for APM160). They are organised in stereo pair
and provided with 1/4" TRS phone sockets. If you connect
only the left jack, the input will operate in mono mode,
that is the mono signal will appear on both input channels.
You can use these inputs with a stereo keyboard, drum
machine, etc.
4 +48 Volt Phantom Power
It is available only to the XLR MIC sockets. Never plug
in a microphone when phantom power is already on.
Before turning phantom power on, make sure that all
faders are all the way down. In this way you will protect
your stage monitors and main loudspeakers.
MIC 1
2 1
3
1
LINE IN
BAL/UNBAL
INSERT
2
1
LINE IN 9
LEFT
(MONO)
LINE IN 10
3
RIGHT
OFF ON
PHANTOM
+48V (CH 1-4)
4
5