Because
of
the
AC
ground, a
"ground
loop"
will
often
be created
when the
audio
cable
is
connected
between
the
Prophet
and
its
amplifier.
As
a result,
low-level
hum
may
occur.
Defeating
the
AC
ground
with a
two-prong
adapter
will
usually defeat
the
hum,
but
this
practice
can
also
set up a
shock
hazard
between
the
units. The
hum
level will
depend
on
exactly
how the
two units
are
connected to
the
AC. For minimal
hum,
use
the
same
outlet
for
both the
Prophet
and its
amplifier.
This
should reduce the
hum to
an
acceptable
level.
In
short,
we
recommend
the
following
steps
when
connecting
the Prophet-5:
1. Plug
the
Prophet
into a
three-prong
outlet.
Don't
defeat the
AC-ground.
2. Plug
all
other
equipment such
as
amplifiers,
volume pedals,
and effects devices into
the
same
outlet.
WARNING:
Do not
overload.
When
in doubt,
consult
an electrician.
3.
Verify all
equipment
grounding with a
ground
tester.
WARNING:
Sequential
Circuits,
Inc.
is
not
responsible
for any
equipment
failure due to
incorrect
AC
power
connections, and is not
liable for any
personal
Injury <hie to
electrical
shocks
as a
result
of poor
grounding.
This is an
excellent time
to
think about
your
amplifier and
speaker system. By
converting
the
synthesizer's
electrical
output
into the
potent vibrations you hear, your
sound
system
becomes
part of
the
instrument. Of
course you can use
anything you like.
But
if your
speakers
are muddy
and weak,
so will be
your sound. Using
your
home
stereo
will
generally
give good
high-frequency
range, but if you go
this route be
careful.
The Prophet has
much more dynamic
range than the typical
stereo
source. It
can generate
powerful transients
which can
damage component
speakers if the volume
is set
too high.
Therefore, you
might consider
using
amplifiers and speakers
specifical-
ly designed for
electronic
instruments.
To protect speakers,
it is customary
to
switch off
amplifier
power when connecting
cable
from
the
Prophet's
AUDIO OUT jack.
Connection and use
of the
enclosed
footswitch is
explained
in paragraph
1-5.
For
other
back-panel connections,
see
Section 3.
1-2
POWER-ON
AND
INITIAL
TUNING
The Prophet
is
turned on
with the
POWER
switch on the back panel. After the
instrument is switched
on, the
front
panel will
be dark—except for the TUNE switch—
for approximately
eight seconds
while
the
computer tunes the
oscillators. When tuning
is completed the front panel
will
light up
and the BANK-PROGRAM numeric display in
the
PROGRAMMER section of
the front
panel will
display
"1-1".
This indicates
that
the Prophet is ready to play and
that
its voices
are
programmed according to
the
settings stored in BANK 1 PROGRAM 1
of the computer's
memory.
To
adjust the overall volume and tuning,
hold down a single key
on the
keyboard (e.g.
middle A) and adjust the VOLUME and
MASTER TUNE controls on the
right side of the
front
panel.
1-2
CMIOOOD 2/82
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