Behringer A500 - Manual (Page 8)

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REFERENCE AMPLIFIER A500
4. INSTALLATION
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The A500 has massive heat sinks on its side frame
that guarantee reliable operation. Never block air
supply to these heat sinks because excessive heat
may damage the components inside your amp. Even
though the protective circuitry guards the inside
components from damage caused by excessive
internal temperatures, you should still double-
check where the amp is placed and inspect cable
connections if you are experiencing thermal
protection dropouts.
4.2 Connections
Inputs
If you wish to use XLR connections for unbalanced input
signals, connect the unused pin on the XLR connector (pin 3)
with the ground. No modification is needed if using mono jacks
(also see ch. 4.3).
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Should you register distractive signals such as
noise or hissing, we recommend separating the
amp input from the signal source. This way, you
can quickly determine if the noise originates in the
equipment connected to the amp. Always make
sure to completely lower amplification of both
channels before powering up the amp (GAIN control
turned all the way to the left). Otherwise, permanent
damage to your speakers may occur.
Outputs
Your A500 offers several output connection possibilities: two
1/4" TS mono connectors and two pairs of touch-safe binding
posts. In addition to both 1/4" TS mono connectors for individual
channels, the A500 also features an extra 1/4" connector for
use in mono-bridged mode.
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Whenever possible, use thick and short speaker
cables to minimize power losses. Never route
output cables near input cables.
When using binding posts, make sure that the wire insulation
is not stripped more than what is necessary, and that wires are
completely inserted into the binding post so that no bare wire is
visible. Cable clamps must be isolated to avoid the possibility of
electric shock. When running the amp in mono-bridged mode,
always use the middle two binding post connectors, paying
attention to correct polarity.
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ATTENTION! If you notice bare cable endings on the
binding post connectors, disconnect the AC mains
and remedy the improper output connection before
powering the amplifier on again.
Connecting to the mains
Always connect your power amplifier to the voltage specified
on the rear of the unit. Connecting the amp to incorrect voltage
can permanently damage it (also see ch. 2, under FUSE
SWITCH/VOLTAGE SELECTION).
Before powering up the amplifier, double-check all
connections and fully lower the gain settings.
4.3 Audio connections
Various cables are needed for different types of applications.
The following illustrations show the correct wiring. Always use
high-grade cables.