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FRONT
&
REAR
CONNECTIONS
(MA500-MA800)
14. L/R
CHANNEL
OUTPUT
CONNECTORS
CONNECTIONS
section
on
page
11 of
this
manual.
15.
BALANCED INPUT
CONNECTORS
{XLR)
The
XLR
connector
is
compatible
with
balanced inputs. Since
the
XLR
connector
is
internally
wired
in
parallel,
you can
parallel
this
unit
with another amplifier
by
using
the XLR to
outputthe
signal
to the
input
connectors
of the
other amplifier. Balanced
connections
are
recommended
as
they
are
less prone
to AC
than
600
ohms
is
needed
to
avoid signal loss.
For
short cable
runs
an
unbalanced signal input should
be
suitable.
For
stereo
(two-channel)
operation,
use
the
inputs
for
both
CH-1
and
CH-2;
for
parallel
or
bridged
mono operation,
use
only
CH-1
input.
(See
MODE SELECTOR SWITCH below
for
more explanation.)
16.
MODE SELECTOR SWITCH
The
MA
Series
amplifiers offer
3
modes
of
operation;
PARALLEL,
STEREO
&
BRIDGED.
Slide
the
switch
to one
ofthe three
.
PARALLEL
(MONO)
INPUT
-This
mode
allows
both channels
to
operate
in
parallel
with
the
same signal
and
without requiring
a
Y-cord.
In
this mode
the
inputs
for
both channels
are
internally
connected,
so
that
you
only need
to
feed
a
signal into
one
of
the
channels, This
still
allows independent
level
control
amps
by
using
the
other channel
of
input connectors.
(Note:
Do not
select
this
"Parallel"
mode when feeding
the
amplifier
with
2
separate
signals.)
(Note:
Do
not
use
both unbalanced
and
balanced cables
in the
same
set-up
as
that
can
unbalance
all the
connections when
daisy-chaining,
resulting
in
hum.)
.STEREO
INPUT -This
is
the
most common mode generally
used,
and
allows
independent
control
of 2
separate signals
such
as
stereo
playback, main
and
monitor live mixes,
and bi-
arnp
operation (highs
in one
channel
and
lows
in the
other).
.BRIDGED
MONO-
This
mode
combines
the
power
of
both
channels
!o
drive
a
single speaker.
In
this mode
the amp
produces
4
times
the
peak power
and 3
times
the
sustained
separately
in
stereo
or
parallel mode.
(CAUTION:
Inthis
mode
the
amplifier
can
deliver high
power
wiring
can
handle this output.
Note
that
for
prolonged
blow,
so
care
musi
be
taken
not to
overload
the
amplifier
in
such
17.
VENTILATION
HOLES
The fan
speed
is
varied
ante
proper
internal operating
ter
Page
10
Reference
Manual
9


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