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SP-20AB MANUAL
two top
(red)
terminals.
In this case,
nothing
should be connected to the bottom (black)
terminals. Positive polarity will be on the left
channel (red) terminal.
SATELLITE/REMOTE OUTPUT:
This output
is a single male XLR connector containing
both the left and right channel outputs. It is
wired as follows: Pin 3 -left (high); Pin 2 -
right (high); and Pin 1 - low, common to both
chan nels. This output should be used as the
starting point for a chain of HR-2 Re mote
Stations (satellites). It necessary, it may also
be used to connect a sec ond set of speakers.
This output is also turned on and off by the
SPEAKERS button. This
output should not
be used with HR-2 Stations when in Mono
Bridged mode.
INPUTS:
The SP-20AB is equipped with
left and right balanced female XLR
connectors. Balanced lines offer the
benefi ts of cancellation of hum, noise, and
RF interference which may be picked up in
the interconnecting cables. For balanced
connections, shielded twisted pair cable
must be used. The wiring is as follows: Pin
1-shield; Pin 2-signal positive; and Pin 3-
signal negative.
Use of the HR-2 Headphone
Remote Stations
The HR-2 Remote Stations may be used
to increase the number of head phones which
can be accommodated by an SP-20AB, and to
place a volume con trol within easy reach of each
individual needing it. This allows the SP-20AB
to be used to power a headphone system for
a recording studio, rehearsal studio, lan guage
lab, demonstration of audio equipment, or for
other applications. The HR-2 units are compact
boxes which easily attach with a thumbscrew
to any micro phone stand Each HR-2 has two
stereo volume controls and two headphone
jacks. There are also two XLR connectors, one
male and one female. These may be used to
“daisy chain” HR-2 boxes together with standard
microphone cables.
Begin the chain at the SATELLITE/REMOTE
connector on the rear of the SP-20AB, as shown
in the above diagram. The SP-20AB connects to
the fi rst HR 2 box; another mic cable connects
the fi rst HR-2 box to the second HR-2 box-, a
third mic cable connects the second HR-2 to
the third HR-2; and so on. If low im pedance
headphones are used, up to twelve HR-2’s may
be in the chain. If medi um or high impedance
headphones are used, 25 or more Remote
Stations may be chained.
If desired, the clip on an HR-2 box may be
hung on a belt it no microphone stand is
convenient.
5
Daisy-chaining HR-2 Remote
Stations to the SP-20AB