Owner's Manual
Digital Output Front Panel Controls
Clock
Select
Lock
LED
-------------
ExtSync
Clock Select
Pressing
this
switch
allows
you to
select
between
sample
frequencies
of 44.1 kHz, 48kHz, 88.2kHz, 96kHz, 176.4kHz, and 192kHz.
EXT
Pressing
EXT
allows
the
ISA One to
be
slaved
to an
external
word
clock
source.
Selecting
256X
allows
the
ISA One to
be
slaved to
an
external
clock
running
at
256
times
faster
than
the
sample
frequency
and
enables
connection
to
systems
such
as
the
Digidesign
'Superclock'
or
other
256X
master
clock
devices.
Lock
LED
When
lit,
LOCK
indicates
that
ISA One is
synchronised
to an
external
word
clock
source.
Note: The LOCK LED
does
not
light
when
synchronised
to 256X,
if
digital
audio
is
coming
out
of
the
ADC
when
synchronising
to 256X
it is
locked.
Recording
a microphone
To
record
a
microphone
signal
with
ISA One,
carry
out
the
following
steps:
1.
Connect
the
microphone
using
an XLR cable, to
the
MIC
1/P
on
the
rear
panel
2.
Select
MICas
the
input
source
using
the
INPUT
switch
3.
If
required,
activate
phantom
power
using
the
+48V
switch.
If you
are
unsure
whether
your
microphone
requires
phantom
power,
refer
to
its
handbook,
as
it
is
possible
to
damage
some
microphones
[most
notably
ribbon
microphones]
by
providing
phantom
power
4. Set
the
gain of
the
microphone
using
the
two
dials
on
the
front
panel
and
observing
the
VU
meter
or
left
hand LED
meter.
The
stepped
gain
sets
the
level
in 10dB
steps,
with
the
Trim
dial
adding
a
further
20dB on top.
If
the
level
is too low, use
the
30-60
switch
to add 30dB to
the
gain
range
5.
Use
the
left-hand
Z
IN
switch
to
adjust
the
input
impedance
if
wanting
to
obtain
more
level
or
change
the
frequency
response
[see
the
Mic
Preamp
Input
Impedance
section
for
details]
6.
Activate
the
HPF and Phase
reverse
switches
if
required
[consult
the
Front
Panel
section
for
details]
The
microphone
signal
will
then
be
sent
to
the
MAIN
0/P
on
the
rear
panel,
as
well
as to
the
first
channel
of
the
ADC [if
installed].
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