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Co-Operator
INSTALLATION
f-
Audio
Input
and
Output Connections
Wire:
We
recommend
using
two-conductor
shielded cable
(such
as
Belden 8451
or
equivalent),
because
signal current
flows through
the
two
conductors
only.
The
shield
does
not carry
signal,
is
used only
for shielding,
and
is
ordinarily
connected
to
ground
at
one end
only.
Because
use
of
single-conductor cables
virtually
eliminates
any
possi-
bility
of
carefully controlling the
system grounding scheme,
it
is
NOT
RECOMMENDED!
Even
so,
it
often
does
work
adequately.
Sometimes,
particularly
if
you
are using the
Co-Operator with musical
in-
struments or
home-type equipment,
single-conductor shielded cable
may
be
the
only
practical alternative.
In
this
case,
connect
the inner
conduc-
tors
of
the shielded cables to the
HI
sides
of
the
Co-Operator
inputs
and
outputs.
Connect
the shield
of
the
Co-Operator
input cable
to
the
LO
input,
and
connect
the shield
of
the
Co-Operator
output cable
to the
Co-
Operator's
IX)
output terminal
on
the rear-panel
barrier
strip.
Connect
both
IN
LO
and
OUT LO
terminals to
^
.
Connectors:
•
Input
and
output connectors
are either
barrier
strip
terminals (with
#5
screw), 'A-inch
tip/ring/sleeve
phone
jacks,
or
XLR-type
jacks.
Levels:
•Nominal
input
level
is
between
-10
and +8dBu.
The
absolute
overload
point
is
+20dBu. (OdBu = 0.775V
RMS;
for
this
application,
the
dBm
@
60012
scale
on
voltmeters
can be
read
as
if
were
calibrated in
dBu.)
•
The
electronically-balanced
input of each channel
is
compatible with
most
professional
and
semi-professional
sound
equipment, balanced or unbalanced,
with
a
source
impedance
of
600
ohms
or
less.
If
the
source
impedance
is
greater
(as
in
some
vacuum-tube
audiophile preamps),
remove
capacitors
C102
(left
channel)
and
C302
(right
channel),
and connect
the
hot
side
of
the
driving
equipment's
outputs
to
the
Co-Operator's HI
inputs.
•
The two
electronically-balanced
and
floating
outputs of each
channel sim-
ulate
a
true
transformer
output.
The
source
impedance
is
30
ohms
(93
ohms
for units
with
serial
numbers below 1306000
—
see
note
on
page
2-14). In
addition, there
is
a
lOOOpF
capacitor
between each
output
(HI
and LO)
to
the
chassis for
RFI
suppression.
The
output
is
capable of driving loads of
600
ohms
or
higher.
• If
an
unbalanced
output
is
required
(to
drive
imbalanced
inputs
of
other
equipment),
it
should be taken
between
the HI
and
LO
outputs.
No
special
precautions
are required
even though one
side
of
the
output
is
grounded.
Connect
the
LO
output terminal
to
^
.
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