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OPERATING THE MULTI
.AMP
SYSTEM
o
Multi-amp
systems have
more
controls
than conventional
systems and
require more careful
adjustments. Perform-
ance varies considerably
with the
pre-amplifier,
power
amplifiers
and speakers used,
as
well
as
with
the
acoustics
of
the
room, and
final
adjustments must be
made
while
you
are
actually listening
to
the
sound.
o
Before
operating
the
SF-500,
first
check
all
connections
correctly.
When re-setting
the
selector
switch,
first
turn
off
the
power
amplifiers
or turn
the volume
fully down.
3.
WAY
SYSTEM
1.
Turn
the LEVEL
MID
and
LEVEL
HIGH
knobs
fully
to
the
left
(i.e.
set
the
levels
to
the
lowest position).
2. Set the
crossover
frequency selector
switch (located
on
the
bottom of
the
SF-500)
to
3
CH.
3. Turn
the
pre-amplifier
output
level
knob
fully
down
and
turn
on the power
to
all amplifiers.
4.
Turn up
the pre-amplifier
output
level
halfway
and,
also,
the level
controls on the
SF-500. Play
a
record or
tape.
5.
Gradually
turn up the
pre-amplifier
output
level
until
the
desired
volume
is
attained.
6. Adjust
the
level
controls
on
the
SF-500 and the volume
controls on all
amplifiers
until
the sound
quality
is
ideally
suitable
to
the
acoustics
of
the
room.
PIONEETT
2.
WAY
SYSTEM
1. Check
the
crossover
frequency best suited
to
your
speakers
and set
the
selector
switch
on the
bottom
of
the
SF-500
to
2
CH.600Hz
or
2
CH.5kHz.
NB.
When
setting
the
selector
switch
to
2
CH.5kHz,
first
check
that
nothing
is
connected
to
the MID
jacks.
Otherwise
the
MID
range speaker
may
be
damaged.
2.
Proceed as
explained
in
steps
3
-
6
for
a 3-way
system
above.
SPEAKER PHASING
o
Since
the
signals
in
multi-amp
systems
are
separated
by
L2dB
/oct. filters,
correct
phase
adjustment
of
the
speak-
ers results
in
more natural
sound. Where
the
MID
range
and
HIGH
range
power amplifiers
are
fitted with
speaker
phase
selector switches,
set
these
so
that
the
sound is
as
natural
as
possible,
during actual listening.
If
there
are
no
switches
on the
polser amplifiers,
try
changing
the
connections
to
the speaker terminals.
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