Kustom III User manual
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KUSTOM WARRANTY
All
Kustom amplifiers,
power
units, mixers, and their associated components
and
parts,
except
as
specified below,
are
guaranteed,
by Kustom Electronics,
lnc.,
to
the
original
purchaser
to
be free of defects
in
material
or
workmanship for a
period
of
five
(5)
years
from
the
date
of
purchase.
-
an
d -
All
Kustom
speaker
cabi
n
ets
and
their
associated components and
parts.
except
as
specified below,
are
guaranteed,
by
Kustom Electronics. Inc.,
to
the
original
purchaser
to
be
free
of
any defectsin materials and workmanship for a period
of
one
(1)
year
from
the
date
of
purchase.
-provided -
(1)
The
original
purchaser
appliesfor a Kustom
Warranty
Card
for
the
guaranteed
product(s) within
10
days
of
the
date
of
purchase;
and,
(2)
Wit
h
in
the
applicable period
of
this
guarantee,
the
original
purchaser
delivers,
at
his own expense,
the
defective
product(s)
to
an Authorized Kustom Dealer
or
Service
Center
for repair; or.
where
no such dealer
or
service
center
is
nearby,
obtains
at
his own expense from
Kus
tom Electronics, lnc., an "Authorization Number"
to
return
merchandise and ships,
at
his own expense,
the
defective product(s) to Kustom Electronics Customer Service,
909 W. Cherry, Chanute, Kansas 66720. The repaired product(s) will
be
returned
freight
prepaid.
Kustom Electronics, Inc., will,
at
its
option, repair
or
replace
the
defective part(s)
or
product(s).
Excluded from coverage by
this
warranty
are
exterior
surfaces
and finishes. face panels.
grill
cloth, covers, knobs,
handles,
casters
and appearance items.
Any modification
of
the Kustom-manufactured product(s)
such
as
the
installation
of
substitute
parts,
rewiring
or
other
changes to
the
system
without
written
authorization from Kustom Electronics, Inc., will automatically void this
warranty
.
Kustc,m Electronics, Inc., shall not
be
liable for any direct, special, incidental
or
consequential damages incurred by
reason
of
a breach of
the
above provisions,
except
as
expressly provided above.
The
provisions
of
this
warranty
shall be covered by
the
local laws of
the
state
where
the
original
purchaser
shall
purchase products covered
hereby.
and shall be enforceable only
to
the
extent,
and in
the
manner,
permitted
under
such
laws.
EXCE
PT
AS HEREIN
EX
PR
ESS
LY PROV
ID
ED, KUS
TOM
E
LE
CTRONICS, INC., MAKES NO WARR
AN
TY,
E
XPR
ESSED
OR IMPLIED,
OF
MERCHANTABILITY, FI
TNESS
F
OR
A
PARTI
CU
LAR
PURPO
SE,
OR OTHERWI
SE.
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INTRODUCTION
The Kustom Ill
Monitor
is a high-performance, reliable and versatile graphic equalizer-
power
amplifier combination. This instruction manual provides useful information which could prevent
problems on a gig. A little time spent reading the manual could save a lot
of
time trying
to
find
problems
that
do
not
exist.
GENERAL
The Kustom Ill
Monitor
is
designed for
the
most
demanding professional application. The
standard system consists
of
one graphic-equalizer-power amplifier and
two
monitor
slants
(cabinets). The monitorslantseach contain a
12"
bass speaker, a diffraction horn and driver, and
a crossover network. The speaker components are carefully designed
to
allow very high levels
without
feedback when used correctly.
The
monitor
-amplifier-graphic equalizer is designed
for
maximum flexibility
of
operation, as
can be seen in the functional block diagram (Figure
2)
. The equalizer
in/
out
switch allows use
of
the unit
as
a graphic equalizer, a power amplifier,
or
a combination
of
the
two
functions.
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INPUTS
The Kustom Ill
Monitor
is
equipped
with
two
high-impedance
input
jacks which are wired in
parallel. This allows the connection
of
up to
10
equalizer-amplifiers in a system.
Connect equalizer-amplifiers from INPUT
to
INPUT, rather than from LINE OUT to INPUT
when using more than one unit.
If
one unit in the series thermal cycles (cuts
off
until normal
operating termperature
is
reached), and the equalizer-amplifiers are connected INPUT to INPUT,
only the cycling unit
will
be lost. However,
if
theseries
is
connected LINE
OUT
to
INPUT and one
of
the
unitscycles, power will be lost
to
all
of
the equalizer-amplifiers following the cycling unit in
the series.
OUTPUTS
The Kustom Ill
Monitor
is
equipped
with
two
power
output
jacks and one line level
output
jack.
Two
monitor
slants are used in the normal configuration and constitute a correct load for
the
power
amplifier. Only the recommended speaker cabinets should be used
with
the power
amplifier-equalizer. Although the power amplifier will
not
be damaged
with
abnormal loads,
it
is
possible to produce. distortion and over-heating. When the
power
amplifier overheats, a
protective device in the unit will cause
it
to
turn
off
for
several minutes. Normal operation will
resume when the amplifier cools
to
its rated operating termperature.
Theline
output
jack
is
provided
to
allow
the
unit
to
be used
as
a graphic equalizer.only and
to
provide a
low
impedance (600 ohm) line level (1.0V RMS)
output
for
driving tape recorders
or
additional
power
amplifiers. (The latter
is
not
recommended; see
"INPUTS"
.)
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CONNECTION
AND
L
OCATION
The location
of
the
monitor
slants will be the most critical
of
all speaker systems in preventing
feedback. Cardioid microphones
MUST
be used, and the
monitor
slants should be placed at the
"null
point"
(the
point
of
least sensitivity) at the rear
of
the microphone.
In
some instances, a
movement
of
two
or
three inches
of
the microphone
or
monitor
slant will cause
or
eliminate
feedback.
Location
of
the
power
amplifier-equalizer
is
a matter
of
choice. However,
if
more than one
amplifier-equalizer is employed, units should
not
be stacked. Heat generated by the
power
amplifiers
might
cause thermal cycling
if
units are stacked. The recommended grouping
is
to
stand the amplifier-equalizers on end, at least 3.0 inches apart.
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OPERATION
The Kustom Ill Monitor_will provide very high
monitor
levels when operated properly.
To adjust the system properly before a performance, adjust the main sound reinforcement
system levels •mtil the feedback
point
is
reached. Then place the equalizer
IN/
0 UT switch
to
the
IN
position and adjust the equalizer slides
to
the center or
"flat"
position. Gradually turn
up
the
MAIN
LEVEL control until feedback occurs.
At
this point, adjust the GRAPHIC EQUALIZER until
feedback is gone.
You are
now
at
the
point
of
optimum
equalization and level.
Some adjustment
of
the
MAIN
LEVEL control may be necessary after the group starts
playing, due
to
the possibility
that
various instruments might cause feedback at a second
frequency. Once the system
is
adjusted,
monitor
operation should be
"hands
off"
for the rest
of
the gig.
Operation
of
the Kustom
111
Monitor
as
a graphic equalizer ONLY is accomplished by placing
the EQUALIZER
IN/OUT
switch in the
IN
position and taking the
output
from
the LINE OUT jack.
The Kustom Ill
Monitor
may be used
as
a power amplifier by placing the EQUALIZER
IN/
OUT switch in the OUT position and connecting the speaker systems
to
the
speaker
output
jack.
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MONITOR
SLANTS
The Kustom Ill Monitor slants are designed
for
very
tight
pattern control in the vertical and
horizontal planes. This pattern control is essential for maximum sound pressure level before
feedback.
The monitor slants are full-range, high-power handling capability systems containing one
12-inch
SRO
bass, and one 120° horizontal x
90
° vertical diffraction horn
with
an
800Hz taper
rate. A 12dB/ octave crossover network at 1.0K
Hz
is
used
for
frequency division.
RACK
MOUNTING
The Kustom I
ll
Monitor may
be
rack mounted in a standard
19"
rack frame.
Two
brackets
and the required hardware are available
as
an option for the Kustom Ill Monitor. To rack
mount
the unit, remove the chassis from the cabinet and attach the brackets
with
the supplied hardware.
Two
standard rack-spaces are occupied by each amplifier. Whenever
two
or
more units are rack
mounted, a fan should be used
to
keep the units at a reasonable operating temperature. All racks,
fans, and related equipment
are
standard industrial items which may be purchased from almost
any industrial electronics distributor.
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TECHNICAL
SPECIFICATIONS
Power
output
measured into a 4.0 ohm load at
1.0KHz. Equalizer
out.
Signal
-
to
-
noise
ratio
.
Main
level
maximum.
Equalizer adjusted at center position.
Frequency response. Measured
with
Equalizer
in and adjusted to center position.
Equalizer control range
at
each frequency.
Nominal inputimpedance.
Line
output
at rated power.
Absolute
minimum
speaker load impedance.
AC accessory receptacle maximum load.
132Watts
RMS@ 1.0% THO
76d8
± 2.0dB, 40Hz
to
17KHz
± 12.0dB
10K ohms
1.0
volt
RMS
3.0 ohms
200
Watts
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