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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.
PL-2 SELECTOR SWITCH(12)
The function of this switch is identical to that of channel A function. The "OUT" position of
this switch selects the QUASI-BALANCED mode of operation for the LOW Z INPUT (XLR
jack) and routes this input signal directly to the HI Z INPUT jacks if these Jacks are not in
use. Since this signal is also routed to the CROSSOVER INPUT jacks, now these jacks may
be used as outputs after the LOW Z INPUT to allow patching this signal to another input on
this amplifier.
Similarly, the "IN" position of the switch routes the input signals from the XLR jack through
the (PL-2) line-balancing transformer thus selecting the TRANSFORMER-BALANCED
mode of operation for the LOW Z INPUT. In this position the CROSSOVER INPUTS may
be used as outputs after the line-balancing transformer to patch the signal to another input
jack on this amplifier or other amps/equipmenl. Again selecting the "IN" position without a
(PL-2) line-balancing transformer IN the receptacle will render the LOW Z INPUT inoper¬
able, and this switch can be used to test the "effectiveness" of TRANSFORMER BALANC¬
ING.
TRANSFORMER RECEPTACLE(13)
This receptacle only receives the optional (PL-2) line-balancing transformer. When condi¬
tions exist that demand the usage of a TRANSFORMER-BALANCED XLR INPUT at the
input of channel "B", or at the input of the PL-MODULE ELECTRONIC CROSSOVER
when BIAMPING then the (PL-2) transformer must be put here, and the selector switch must
be in the "IN" position.
CROSSOVER INPUTS (14)
These are the HI Z INPUTS for the ELECTRONIC CROSSOVER when installed. Two
parallel input jacks are again provided at this point, allowing the flexibility of line out capa¬
bility here as well. These jacks are also not chassis grounded and will provide a QUASI-
BALANCED input capability to minimize potential groundloops. Again, this feature is
automatic. As mentioned, the output of the low Z input circuitry of channel B is always
connected to these inputs, which allow the LOW Z INPUT to be used as the ELECTRONIC
CROSSOVER input if desired. These inputs then can be used as the FULL RANGE outputs
allowing additional patching capability.
CAUTION: When a full range signal is patched into either the XLR input or the crossover
inputs on channel B to feed the crossover module itself this full range signal is also routed to
the channel B input. The final patching from the crossover output to the channel B input
■disconnects this full range signal feed to the channel B input and instead is patched to the
appropriate crossed-over signal. This occurs because the channel B input jacks are switching
type. If you were to inadvertently disconnect the cable which is routing the crossed-over
signal to the channel B input, the switching arrangement will feed a full range signal to that
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