Zoom A1 FOUR Operation Manual page 12

Turn the MAA-1 power on.
1.
Set to the ON position.
will light red.
When connecting a condenser mic or other device that requires phantom power, set it to the +48V
position.
NOTE
When connecting devices that are not compatible with phantom power, do not set
so could damage the device.
Adjusting the MAA-1 input level
1.
Turn .
Adjust so that
If the input level is too high,
lights green.
will light red.
12
to +48V. Doing