Orban 622B User Manual

TABLE
I:
TYPICAL
INPUT/OUTPUT
CONNECTION
RULES
INPUT
Always
use
"+"
and
as the two input
terminals
to the 622.
When the 622
is driven from
an unbalanced
source, connect
shield both
to
circuit ground
of source, and
to chassis
ground
of
622.
When the 622
is
driven
from a
balanced
source, connect
shield
at source end
to
chassis
ground.
Do not connect shield
at
622
end.
OUTPUT
On the
622 output,
connect shield
at
622
end to
chassis
ground (whether
driving
balanced or unbalanced).
Do
not connect
shield
at other end.
When
driving
a balanced
load, jumper circuit
ground
to chassis
ground on 622
(on rear panel). When driving an
unbalanced
load,
do
not
attach
jumper.
622
chassis
should always
be
earth-grounded
(i.e. through third wire in power
cord
or
through rack.) For maximum protection from
shock, float
this ground
only
as last resort.
If optional output
transformer(s) are installed on
622,
jumper the circuit
ground
to chassis ground on the
622.
Because it is not always possible to determine if the
pieces of equipment driving
or being
driven by the
622
have their circuit grounds internally connected to their
chassis grounds (which are always connected
to
the ground prong of the
AC
line
cord), and
because
the
use
of the
AC
power line ground often introduces problems
because it
can be noisy
or
otherwise imperfect, the wiring
techniques
in the
diagram
are
not
universally
applicable.
If
you follow the
diagram
and hum
or noise appears, don't be afraid to
experiment. If the noise
sounds
like
a
low-level
crackling buzz, then probably
there
isn't
enough grounding.
Try
connecting the input
of
the 622 to
a
chassis ground
terminal on the
622's barrier strip and see if the buzz goes away. You can also try
strapping the
622's chassis and circuit grounds together, and see if
this
helps.
A
ground loop
usually
sounds like a
smooth,
steady hum rather than
a
crackly
buzz. If
you have a ground loop, you can often break it by disconnecting
the
jumper
between circuit and chassis grounds on the
622's
rear-panel barrier strip.
In
either
case,
think
carefully about what is going on, and keep in mind the general
principle: one and only one circuit ground path should exist between each piece of
equipment! (Bear
in mind that the circuit grounds
of
the two channels of
a
622B
are connected
together internally, and could conceivably introduce
a
ground
loop if
you do not take this
connection into account in planning
your wiring.)
5

Orban 622B Specifications

General

Brand	Orban
Model	622B
Category	Stereo Equalizer
Language	English