Hafler P1500 - Manual (Page 16)

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OUTPUT CONNECTIONS
The speaker output connectors are dual binding posts. These binding posts will directly accept 12 AWG wire
or banana plugs and are spaced on 3/4" centers to accept dual banana plugs.
MONOPHONIC USE
For systems with high power requirements, the amplifiers can be configured for single channel bridged mono
operation. To bridge the amplifier, set the rear panel Mono/2 Channel switch to the Mono position. The
Channel 1 input and level control is used and the Channel 2 level control must be set to its maximum gain
position. The speaker is connected to the RED output binding posts.
When the amplifier is bridged the output is floating. Any speaker which requires a common ground from
the amplifier output cannot be used in this application.
Since a bridged amplifier shares the load between the two channels, each channel will effectively drive
half of the load. Therefore, for bridged mono operation we recommend using an eight ohm load as the
minimum impedance.
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P E R A T I O N
POWER SWITCH
The POWER switch is located on the front panel of the amplifier. An internal lamp indicates when it is turned on.
Standard practice is to turn the amplifier on last and off first when switching components to prevent
sending damaging transients to the speakers.
It is possible to leave the power switch in the on position and switch the amplifier remotely through a power
distribution block or preamp switched outlet. When doing so make sure the switch is rated for the current
required by the amplifier.
LEVEL CONTROLS
The input sensitivity for each channel can be adjusted individually using the level controls on the front panel.
The gain control on an amplifier is usually fully advanced to its maximum (rated) sensitivity. In public systems
where it is necessary to match levels, the knobs can be removed and the controls adjusted with your fingers or
a flathead screwdriver. Cover the holes with the enclosed plugs to restrict access.
MONO SWITCH
Conventional two-channel stereo operation is obtained with the MONO/2 CH switch in the 2-Channel
position. For high powered single channel use, switch to MONO and use the Channel 1 input and connect the
speaker to the RED binding posts.
For thermal considerations we do not recommend using less than an eight ohm load on the amplifier
when running it in mono.
When the switch is set in the mono position, the Channel 1 (+) and (–) inputs are connected to the Channel
2 in reversed polarity, which inverts the Channel 2 output. The gain is controlled by the Channel 1 level
adjustment; set Channel 2 to maximum.
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