Page 1
Amplifiers
dissipate
much
of
the
power
they
consume
in
heat.
The
KMA-160
should
be
installed
in
a
location
that
provides
unobstructed
ventilation.
If
you
have
to
install
the
units
on
shelves
or
in
a
cabinet,
extra
ventilation
might
be
necessary.
This
can
be
easily
done
with
fans
in
a
variety
of
ways.
Generally,
with
the
front
and
rear
open,
2
-
3
inches
clearance
each
side
and
8
inches
above
the
amplifier,
ventilation
will
be
adequate.
The
dimensions
of
the
KMA-160
are:
23"
wide
x
22"
deep
x
9
high.
The
units
weigh
80
pounds
each;
shipping
weight
is
i00
pounds
each.
INPUT
CONNECTIONS
The
KMA-160
has
bo~h
balanced
and
single-ended
inputs.
The
balanced
input
uses
the
3-pin
XLR
connector
and
the
single-ended
input
uses
the
RCA
connector.
The
pin
assignment
for
the
XLR's
is:
pin
1
=
signal
ground;
pin
2
=
non-inverting
input;
pin
3
=
inverting
input.
The
RCA
connector
is
wired
in
parallel
with
pin
2,
the
non-inverted
input.
Only
one
of
these
inputs
should
be
connected
to
a
preamplifier.
The
input
that
is
not
connected
to
the
preamplifier
can
be
used
as
an
output
to
a
second
amplifier
for
power-biamp
applications.
Before
proceeding
with
such
an
installation
you
should
consult
your
Dealer
or
the
factory.
INSTALLATION
After
inspection
of
the
amplifiers
for
any
shipping
damage
they
are
ready
for
instaila~ion.
The
wiring
to
and
from
the
amplifiers,
and
all
components
in
general,
should
be
arranged
in
a
neat,
organized
manner.
Specifically,
AC
wires
should
be
separated
from
audio
wires.
This
avoids
hum
or
other
unwanted
noise
from
being
induced
into
the
system.
The
KMA-160
has
four
sets
of
five-way
binding
post
speaker
connectors.
These
are
wired
in
parallel
and
have
identical
function.
It
is
always
preferable
to
run
long
interconnect
cables
to
the
amplifiers
and
keep
speaker
cable
length
to
a
minimum.
Speaker
cable
does
add
impedance
between
the
amplifiers,
regardless
of
its
guage.
All
KRELL
amplifiers
will
drive
the
lowest
impedances
with
ease.
When
impedance
is
added
in
any
significant
amount,
amplifier
power
is
literally
wasted
in
driving
the
cable,
thereby
reducing
the
maximum
power
that
can
be
delivered
to
the
speaker.
The
feet
on
the
KMA-160
can
be
used
two
different
ways.
They
are
made
from
machined
aluminum
and
are
supplied
with
separate
rubber
bottoms
and
mounting
screws.
The
rubber
bottoms
can
be
screwed
into
the
the
feet
for
protection
of
fragile
surfaces
such
as
hardwood
floors
or
furniture.
For
use
on
rugs
we
recommend
using
the
feet
without
the
rubber
bottoms.
Page 2
PROTECTION
CIRCUITRY
The
KMA-160
has
a
sophisticated
series
of
circuits
that
protect
it
from
dangerous
input
signals
or
loads
on
the
output.
They
also
analyze
various
amplifier
functions
to
prevent
speaker
damage
caused
if
the
amp
should
fail.
When
the
protection
circuit
is
engaged,
the
amplifier
will
stop
functioning.
The
on/off
switch
will
remain
illuminated
and
in
the
on
position.
Switch
it
to
the
off
position.
After
resolving
either
the
input
or
output
problem
and
leaving
the
unit
off
for
a
short
time,
it
can
be
turned
on.
The
minimum
cycle
time
for
the
protection
circuit
is
i0
seconds.
Important:
if
the
amplifier
does
not
come
on
following
this
procedure,
contact
your
dealer.
WARRANTY/SERVICE
I~;FORMATION
There
are
no
fuses
or
user-serviceable
parts
in
the
KMA-160.
The
warranty
on
the
KMA-160
is
5
years
for
parts
and
labor,
and
includes
return
freight.
Returns
can
be
handled
either
through
a
dealer
or
by
direct
contact
with
the
factory.
Please
do
not
return
any
unit
to
Krell
for
repair
without
first
calling
to
discuss
the
problem,
and
to
obtain
a
Return
Aur_horization
number
if
the
unit
must
be
repaired.
