Mackie SRM450v2 Owner's Manual page 13

For the US 120 V model:
A maximum of five SRM450v2s can be connected per
15A service.
This allows each SRM450v2 to be safely operated at its
maximum level.
When turning your system on, turn on the SRM450v2s
last. This will stop any turn-on thumps and bangs from your
source equipment being amplified.
When turning off your system, turn off the SRM450v2s
first. This will prevent any turn-off thumps and bangs from
your source equipment being amplified.
When setting up for a show, often you
are plugging into an AC power
distribution system you know
nothing about. You may even be faced
with 2-wire outlets that are missing the
third safety ground pin. It's a good idea to have a three-wire
AC outlet tester in your toolbox so you can check the
outlets yourself to make sure they are wired correctly.
These testers will tell you if the polarity of the hot and
neutral wires is reversed and if the safety ground is
disconnected.
COMPRESSOR
EFFECTS
SRM450v2: AC CONNECTIONS
Don't use an outlet if it is wired
improperly! This is to protect yourself
as well as your equipment.
Never remove the ground pin on the
power cord of the SRM450v2 or any
other component. This is very dangerous.
CD
13