1-3
POWER
CONNECTION
WARNING! It is
up to
you to check the power and
ground
interconnections of the
Prophet-600 and ail other
instruments and
equipment you use to prevent potentially lethal shocks. Sequential
Circuits, Inc. is not responsible for
any equipment
failure due to
incorrect AC power connections, and is not liable for any personal
injury due to electrical shocks as a result of
unsafe
grounding practices.
The Prophet-600
comes with a three-prong power plug to insure safe grounding
with
other
equipment. The ground prong is connected directly to the
metal
chassis. Because
of
this AC ground, a "ground loop"
will often be created when
an audio cable is
connected
between the Prophet-600 and standard amplifiers. As
a
result, low-leve!
hum may occur. Defeating the AC
ground with a two-prong adapter will
usually defeat
the hum but this practice
can set
up
a shock hazard between the units. The
hum levei
will
depend on exactly
how the synthesizer and amplifier are connected
to the AC. For
minimal
hum,
use
the same AC outlet for the Prophet-600 and its amplifier.
This
should
reduce the hum to an acceptable level.
1. Connect the
power
cable to
the power fixture on the Prophet-600.
2. Check that the Prophet-600 power switch is in off position.
3. Connect the other end of the power cable to a properly grounded three-prong outlet.
Don't defeat the
AC-ground.
4. Plug all other equipment such as effects devices, mixers, amplifiers and
recorders
into the same outlet.
WARNING!
Do not
overload. When
in doubt, consult an electrician.
5. As you
probably know, many
older buildings and clubs are notorious for their
poor
quality AC wiring.
We
therefore urge you to use one of the several available
"ground-
checking" devices to verify AC connections.
\-U AMPLIFIER AND SPEAKER CONSIDERATIONS
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, the
sound system becomes part of the instrument. Of course you can
use
anything
you like
and can afford. But obviously a synthesizer of this caliber should not be
constrained by
a weak amplifier and muddy speakers.
Particularly because the synthesizer develops
a
much
greater dynamic range than the
typical audio source, a greater margin of amplifier headroom is
needed to prevent
clipping, thus ensure
the cleanest
possible sound (and
possibly preventing tweeter or
horn damage). In consideration of this it is not difficult to justify
committing a stereo
amp
of
200W/channe] for performance. While a mono arnp will
suffice, a stereo
1-2
CM600A 12/82
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