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input of channel "A", the (PL-2) transformer must be put here, and the selector switch must be
in the "IN" position.
SPEAKER OUTPUTS (9)
Two 1/4" jacks and 5 way binding post speaker output terminals are provided. All these
outputs are in parallel, hence the speaker connection cables can be terminated with 1/4" phone
plugs, banana plugs, or stripped wires for use in the binding post terminals. For sustained high
power applications, the use of the binding post terminals are recommended; however, care
must be exercised to assure correct speaker phasing. Regardless of what connections are used,
the typical parallel speaker load should always be limited to 2 ohms per channel or 4 ohms
BRIDGE mode for any application. Operation at loads of 4 ohms per channel or 8 ohms
BRIDGE mode is more desirable for sustained operation applications due to the fact that the
amplifier will run much cooler at this load. Operation above 4 ohms per channel, and even
open circuit conditions, can always be considered safe; however, sustained operation at loads
below 2 ohms could result in temporary amplifier shut down due to the thermal limits and/or
the internal faultcircuitry.
CHANNEL B
NOTE: On this channel a crossover module "ISLAND" has been provided to allow a
PL-MODULE ELECTRONIC CROSSOVER to be used to perform a "BIAMP" function.
Associated with this island are dual crossover input jacks, high and low output jacks, and a
crossover receptacle. These will be discussed further in following sections, but please note that
the channel B patches are somewhat different from those of channel A.
HIGH Z INPUT JACKS (10)
Two parallel input jacks are also provided in this channel, allowing the flexibility of the Y-cord
capability here as well These jacks are also not chassis grounded and will provide a QUASI-
BALANCED input capability. Both of these input jacks are "switching" type, where usage of
either of these jacks disables the signal feed from the LOW Z INPUT circuitry associated with
this channel. This is necessary to allow this input to be patched from the appropriate electronic
crossover output jack and then use the LOW Z INPUT circuitry as the input for the electronic
crossover. This feature prevents these jacks from being used as outputs from the LOW Z
INPUT circuitry, as was possible with the Channel A input jacks.
LOW Z INPUT(II)
A conventional three-pin, female XLR input jack is also provided here, and it can be used as
the channel B input, provided the HI Z INPUT jacks are not being used. When the (PL-2) line-
balancing transformer is not used, this XLR input becomes QUASI-BALANCED with the
exact same pinout arrangements as discussed for channelA. When the (PL-2) line balancing
transformer is used, this XLR input becomes fully TRANSFORMER-BALANCED, again
with the same pin polarities as those presented for channel A. (See the PL-2 SELECTOR
SWITCH manual section for details on related settings). The output of this low Z circuitry is
always connected to the CROSSOVER INPUTS and thus this low Z feature can be used as the
input for the crossover module if the application demands the use of an XLR connector.
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