Parallel
Connections
A
parallel
circuit
is
established
when
voice
coils
are
connected
in
a
way
that
there
are
multiple
paths
for
audio
signals
to
flow
“in”
and
multiple
paths
for
audio
signals
to
flow
“out”.
When
speakers
are
connected
in
parallel,
the
total
resistance
at
the
amplifier
is
proportionally
divided
based
on
the
value
of
each
individual
voice
coil
resistance.
The
term
“divided”
simply
means
all
of
the
values
together
in
parallel
are
a
SMALLER
value
than
each
all
by
itself.
For
example,
if
you
were
to
parallel
connect
two
speakers
to
the
front
right
channel
of
the
amplifier:
The
positive
output
terminal
of
the
right
channel
connects
to
the
positive
input
post
of
the
first
speaker
and
to
the
positive
post
of
the
second
speaker.
An
example
of
a
PARALLEL
connection
between
two
speakers.
The
negative
output
terminal
of
the
right
channel
connects
to
the
negative
input
post
of
the
first
speaker
and
to
the
negative
post
of
the
second
speaker
.
The
total
impedance
of
equal
speakers
in
parallel
is
found
by
dividing
the
impedance
of
one
speaker
by
the
number
of
speakers.
For
example;
two,
eight
‐
ohm
speakers
in
parallel
is
a
four
‐
ohm
load
(eight
ohms
divided
by
two),
four
eight
‐
ohm
speakers
in
parallel
is
a
two
‐
ohm
load
(eight
ohms
divided
by
four).
Two
‐
ohm
single
channel
loads
are
NOT
RECOMMENDED!
Running
your
amplifier
below
recommended
impedance
level
can
cause
excessive
heat
and
will
eventually
drive
the
amplifier
into
protect
mode
(blinking
red
LED’s
on
the
front
of
the
unit).
Parallel
connections
are
harder
on
the
amplifier
than
series
connection,
as
the
total
impedance
is
lower
compared
to
driving
a
single
speaker,
and
the
amplifier
must
produce
more
current
to
drive
them.
Ideally,
the
total
average
impedance
should
be
no
less
than
4
ohms
per
channel.
You
must
make
sure
that
the
lower
impedance
does
not
cause
the
amplifier
to
overheat,
shut
down,
or
trip
your
circuit
breaker.
If
this
happens,
you
should
reduce
the
number
of
speakers
wired
in
parallel,
rewire
them
in
series,
or
use
more
than
one
power
amplifier.
Technical
Note
about
Multiple
Speaker
Connections
Although
there
are
two
possible
connection
types
discussed
in
this
manual,
it
is
imperative
that
with
either
connection
type
that
you
use
loudspeakers
of
the
same
type
and
nominal
impedance
for
these
connections.
In
doing
so,
you
have
the
most
predictable
outcome
for
your
installation.
When
speakers
of
different
nominal
impedances
and/or
different
bandwidths
are
used,
there
are
many
other
acoustic
problems
that
come
into
play
in
addition
to
complex
impedance
at
the
amplifier’s
speaker
output
terminals.
If
you
must
use
multiple
speakers
on
any
individual
amplifier
channel,
please
use
speakers
as
close
to
identical
as
possible.
27
Summary of Contents for XPA-1
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