|240,000yen(one-set, around the 1979 time)
The technology of the studio monitor loudspeaker
which JBL has, and the floor type speaker system which introduced a new
LE14A which is the 36cm cone type Woofer adopted also as
L101 is adopted as low-pass.
The Alnico V magnet of JBL tradition is adopted
as a magnetic circuit, and the copper ribbon line is made into an edgewise
volume, and is used for a voice coil 10.2cm in diameter. To aperture, since the
diameter of a voice coil is large, it has the outstanding transient response and
Moreover, passive radiator PR15C of the same 38cm aperture
as Olympus S508 is adopted as low-pass.
Since compliance is very high and an
about 30% dimension is larger than a Woofer, the low-pass response has been
improved by using together with LE14A.
LE5-9 of a 13cm cone type
squawker is adopted as a mid range.
In order to prevent the interference
from a Woofer, it is dedicated in the independent chamber, and a sub baffle
board is formed behind a main baffle board, and it mounts on it.
acoustic lens for exclusive use is attached to the front of this subbaffle, and
the sound which came out of the squawker with this acoustic lens is led to a
main baffle side, and you are making it spread.
076 of a horn type
tweeter is adopted as a high region.
It is an ellipse horn type with a ring
diaphragm peculiar to JBL, and, as for the structure which leads to the
exponential horn which the cross section made the ellipse form, the control of
directional characteristics is performed from the phasing plug which keeps a
phase and a swing constant.
Each unit arranges the location of the voice
source of a unit, and the sound which comes out of each voice source keeps equal
attainment time until it results in a front baffle.
Moreover, the voice
source which the unification was able to take is acquired by considering it as
the in-line placement arranged in the vertical single row, and the more exact
image lateralization is enabled.
Equalization and the phase compensator
of an impedance are built in the network, and the design is carried out to it so
that neither a peek dual in-line package in the cross-over-frequency
neighborhood of each loudspeaker unit nor phase disorder may be caused.
The enclosure is given hand polish finish traditional to a black walnut.
The front had the floor form which carried out the large trapezoid, and form
has minimized the proprietary floor space.
||3 ways, 3 loudspeaker passive radiator
scheme, and a floor type
||For low-pass: 36cm cone type (LE14A)
mid ranges: 13cm cone type (LE5-9) + acoustic lens
For high regions: Horn
Passive radiator :P R15C
Exclusive 3 way network
||75W (succession sine wave)
|Cross over frequency
|Output sound pressure level
||90dB (new Japanese Industrial Standard)
||Width 512x height 1225x depth of 390mm
||48kg (at the time of an original packaging)