B-52 ACTPRO12M Instruction Manual - Actpro
B-52 ACTPRO Active Systems - Instruction Manual
THE BEAUTY OF POWER
ACTPRO
13
REAR PANEL CONTROLS (cont.)
best overall bass response.
10. GROUND LIFT SWITCH
All ACTPRO active loudspeakers’ amplifiers are
equipped with a GROUND LIFT switch. Powered
loudspeakers are often fed by long run signal cables,
and connected to power outlets different from power
outlets for audio sources. It may create an audible
hum or buzz due to ground loops or other connec-
tion problems. GROUND LIFT switch will help you to
avoid it. It is a good practice to keep the GROUND
LIFT switch in EARTH position unless you have hum or
buzz coming from your speakers. If you do hear hum
or buzz, try to toggle switch into LIFT position.
WARNING:NEVERBREAKEARTHCONNECTION
IN YOUR AC PLUG. IT MAY CAUSE PERMANENT
DAMAGE TO THE AMPLIFIER AND MAY CAUSE
DANGER OF ELECTRICAL SHOCK TO YOU AND
OTHERS.
11. POWER SWITCH
Push in the top of the power switch to apply AC pow-
er to the powered loudspeaker’s amplifier. Push in the
bottom of the power switch to turn the loudspeaker
amplifier off. When turned on, the blue POWER indi-
cator LED on the front grille will illuminate, along with
the POWER and PROTECT LED on the amplifier; after
a few seconds the yellow PROTECT LED indicator will
dim and turn off.
NOTE that System Power Sequencing prevents un-
expected sounds from your system (pops, clicks,
thumps), make sure to power ON your ACTPRO
series loudspeakers in the proper order. Improper
sequencing while powering ON your equipment can
damage the loudspeakers. Power the loudspeaker
system ON and OFF in the proper order to avoid un-
expected sounds and damage to your loudspeakers.
PowerOnSequence: Turn ON all source devices
(CD players, mixers), turn ON the subwoofer, then
turn ON all Full-range loudspeakers.
PowerOFFSequence: Turn OFF all Full-range
loudspeakers and then subwoofers. Lastly, power
down all source devices.
12. AC MAINS
Connect IEC connector of the AC power cord to the
IEC socket on the back of the amplifier by insert-
ing the IEC power cord fully into the IEC inlet on the
power amplifier module.
NOTE: Turn off the power switch on the ACTPRO
before connecting the AC power cord. The correct
AC line voltage should be selected on the rear panel.
For operation in the United States, leave the voltage
selectorontheamplifiersetto115V.Connectingto
the wrong line voltage will damage the amplifier and
may create the risk of electric shock.
ACMainsDisconnection: Turn the AC power
switch to the off position. To remove the AC power
cord, grasp the IEC connector’s plastic body and
gently remove the IEC connector from the socket by
pulling it straight toward you.
13. AC SELECT SWITCH
Make sure the AC Select Switch is set to the voltage
appropriate to the country it is being used in.
NOTE: If the voltage switch is set incorrectly and does
not match the appropriate voltage the amplifier may
become damaged and it may create a risk of electri-
cal shock.