TAPE
DUBBING
PROCEDURE:
When
using the
SP9
as a control
center
for
recording, the program source to
be
dubbed
must
be
connected to
one
of the
five
inputs
controlled
by
the
front
Input
selector.
This routes the
selected
program to the Recorder l/Recorder 2
outputs,
which
should
connect to the ''aux'' or
''hi-level''
inputs
on
the
recorder(s).
(Check
to
make
sure
your recorder
doesn't
short
its
inputs
when
it's
not in ''record''
mode.
If
it
does,
it
may
severely
load or
distort
the SP9's output
signal.)
The
Tape
l/Tape 2 inputs are
for
listening
or monitoring only through the
main
outputs,
and
cannot
be
routed to the Recorder l/Recorder 2 outputs
for
dubbing.
When
using these
inputs,
your tape recorder should
be
switched to "Tape" or "Monitor,"
if
it
has
separate
record
and
play heads. This allows
true
"A-8"
comparison of
signals
before
and
after
recording, using the Monitor/Source switch
on
the
SP9.
Two
recorders
may
be
used simultaneously to record the
same
program.
While
dubbing
is
in process, the signal
from
either
of the
Tape
l or
Tape
2 inputs
may
be
listened
to
by
switching to "Monitor"
and
selecting
the
appropriate
Tape
l
or
Tape
2
input.
Switching
back
to "Source"
returns
the
listener
to the
program
being dubbed.
Two
different
programs
may
be
recorded simultaneously
by
routing
one
program
directly
from
its
source to the recorder (bypassing the
SP9)
and
routing the
other
source
through the
SP9
and
its
Recorder
outputs.
Then,
two
different
programs
may
be
monitored through the
Tape
l
and
Tape
2
inputs.
If
you
wish
to use a tape
unit
both as a program source to
be
dubbed
and
as a recorder
with monitoring
provisions,
then use
"Y"
connectors to feed both Spare
and
Tape
l inputs
on
the
SP9
from
the recorder
outputs.
Then
either
function
may
be
selected
without
changing connections.
Remember
that
if
you
accidently
select
the output
of
your
recorder as a signal source
and
send
this
same
signal
back
to the
same
recorder's
inputs,
you
may
generate
an
''echo loop'' or wild
oscillations,
depending
on
the gain
settings
on
the
recorder.
MUTING
PROVISIONS:
The
SP9
has
several prov1s1ons to help
protect
against
misuse
of
the exceptional
dynamic
range
and
wide
bandwidth
that
it
offers.
It
is
not
subject
to
damage
itself,
but
some
power
amplifiers
and
speakers are
more
limited
in
their
ability
to withstand signal
extremes. These
provisions,
both
manual
and
automatic, are designed not to
interfere
with a flawless
listening
experience of unprecedented
realism,
while giving reasonable
protection
against
warm-up
surges
and
power
line
interruptions.
However,
for
absolute
protection
of
associated
equipment
some
operator
understanding,
and
responsibility,
is
required.
Initial
"settling"
time
of
all
circuit
parameters within the
SP9
requires
approximately
5 to 10 minutes.
The
automatic muting
circuitry
timer
is
adjusted
for
about
45
seconds.
(This
is
because
recurrent
interruption
"settling"
time
is
much
less.
You
would
not
want
to wait
for
5-10 minutes each time such
an
interruption
occurred.)
The
Mute/Operate Switch allows
manual
disabling
of the
SP9
outputs during
any
moving
of
the tonearm or switching of equipment.
Use
of
this
switch will minimize
stress
on
your
amplifier
even
if
it
is
''off."
It
is
also
highly reconnended
that
manual
muting
be
employed
during the
initial
45
second
warm-up
period as well
as
during
turn-off
for
maximum
protection.
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