Architectural specifications
The
loudspeaker
system shall consist
of
three
direct-
radiator
transducers
and frequency
dividing
network
installed in a
tube-port
ed enclosure.
Loudsp
eakers, ne
t-
work
and
enclosure
are to
be
manuf
actured and assem-
bled by a single
manufactur
er.
Components
shall be
removable from the front
of
the enc
losur
e.
High
fre-
quency
transducers shall be
mount
ed on a raised
baffle
to suppress
cavity
and
diffraction
effects
.
The
low
frequency
loudspeaker
sh all have a 3" edge-
wound
copper
ribbon
voice
coil
operating
in
a
magnetic
fi
eld
of
at least 9,000 gauss. A heavy
duty
5"
transducer
shall
reproduce
the range from 1500 to 7,000 Hz. It shall
have a
7'8
" edge
wound
copper
ribbon
voice
coil
operating
in a magnetic field
of
at least
16
,500 gauss.
Frequenc
ies
above 7 kHz shall
be
reproduced
by a third
direct
radia-
tor havi ng a cone
diameter
of
ap
proximat
ely 1
%"
and
a
gap
flux density
of
at
least
16
,000 gauss.
The
fr
eq
uency
dividing
ne
twork
shall
include
two
controls, a
ccessible
from the front
of
the system, to
adjust
relative intensities
of
"presence"
and
"b
rilliance"
ranges respectively.
Set for flattest response,
th
e free-field response
of
a
typical system shall not vary
mor
e than
±3
dB from 45
to
15
,000 Hz. Response measured
up
to 45'
off
axis,
either
hor
izontally
or
vertically, shall not
deviate
more than 6
dB
from on-axis response at 2 kHz,
or
more than 10 dB at 8 kHz. These
specif
ications
include
the effects
of
the
dividing
network
and any
interaction
between transducers.
Performanc
e
claims
which
are
extrapolated
from the response
curves
of
individual
loudspeakers are
not
acceptable.
The
loudspeaker
system shall have a nominal
impedance
of 8 ohms and a
power
capacity
of
at least
50
watts
program
materia
l.
The EIA sensitivity
of
the system
(30 feet on-axis with one milliwatt i
np
u
t)
shall be
approximately
42
dB.
The
enclosure
shall be
solidly
constructed
of
3/
4
-inch
stock
with all
joints
tightly
fitted and glued.
Overall
dimensions
shall be no
greater
than
24"
x
15
" x
12"
deep. Finish shall
be
textured gray
with
charcoal
grille
fabric.
Model 4310 specifications
Power
capacity
50
watts
program
Crossover
1500 and 7,000 Hz
Nominal
impedance
8
ohms
Dispersion
90
"
horizontal
and
vertical
Frequency
response 45-15,000 Hz :
+:
3
dB
Sensitivity
42
dB
at 30 feet
with
one
milliwatt
in-
put, averaged 500 to 2500 Hz,
with
controls
set for
flattest
response.
(Because
of
its
uniform
response
over
the full
audible
frequency
range,
the
sensitivity
of
Moder
4310
below
500 Hz
or
above
2,000 Hz may
be
considerably
greater
than that
of
other
systems
with
higher
published
sensitivity
ratings.)
Finish Oiled walnut or textured gray with
charcoal grille fabric.
Dimensions
23%"
x
14%"
x
11%"
deep
60 x 36 x 30 cm
deep
Shipping weight
51
Ibs.
23 Kg .
Jam
es
B.
Lans
i
ng
Sound
,
Inc.
3249
Casitas
Ave
.,
Los
Angel
es,
Caltf.
90039
PPB.
431
0 1173
P'ln1.
n U S
.A.
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