B-52 US Series Professional Power Amplifiers - Instruction Manual
THE BEAUTY OF POWER
US SERIES AMPLIFIERS
Reduce the output volume using the specific channel’s
level controls until the clipping disappears or until the
CLIP LEDs flash only occasionally.
7. PROTeCT INdICATORS
These yellow LEDs indicate that the channel is in either
PROTECT mode or MUTE mode. When the channel
goes into protect mode its output will turn OFF. This is
to protect the speakers connected to that channel.
NOTe:
The protect LED will light when the
heatsink is overheating. Once the affected
channel’s heatsink cools down, the output signal
will automatically resume and the PROTECT LED
will turn OFF. Constant triggering of the thermal
protection indicates blocked vents, dusty air
filters, possible low load condition, or problems
with your speakers or cables.
NOTe:
The PROTECT LEDs will illuminate for
about two to three seconds when the amplifier is
powered ON and they will fade slowly when the
amplifier is powered OFF. This indicates your
amplifier is going through a transition process
and the outputs are muted.
WARNINg:
If the PROTECT LEDs illuminate
constantly and don’t turn OFF, even when
the speakers are physically disconnected from
the amplifier’s outputs, this indicates a fault.
Immediately turn the amplifier OFF, disconnect
the power cord from the AC outlet, and refer the
amplifier to service personnel. Authorized B-52
service centers are listed at www.B-52Pro.com
8. BRIdge led
This green LED illuminates when the MODE switch on
the rear panel is set in the BRIDGE position. Use the
Channel 1 LEVEL control to adjust the output volume
in BRIDGE MONO mode; the Channel 2 LEVEL con-
trol is inactive in this mode.
9. POWeR led
The blue LED will illuminate when your amplifier is
turned ON.
10. PARAllel led
This green LED illumiates when the MODE switch on
the rear panel is set to PARALLEL. Use the Channel 1
LEVEL control to adjust the output volume of Channel
1 and the Channel 2 LEVEL control to adjust the out-
put volume of Channel 2, even though both channels
amplify the same signal connected to the Channel 1
input.
11. AC POWeR SWITCh
Use this switch to turn your amplifier ON or OFF.
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