Size matters. With surface of 21 sq. cm (3.25 in. sq.), super-light 22
mg flat foil, deflector pads, homogenous magnetic field, it represents
the finest in today’s mid-high transducer design. Many other details
in its construction serve as tools to achieve the flattest possible
frequency response and fastest settling time. Its fast and accurate.
The main difference is that, contrary to other ribbon drivers, it
recreates the spherical sound wave, although it is a straight line
source, so the high frequency range is not emphasised and “beamed” to
a vertically very narrow space.
Bad directivity characteristics is very audible, like constant
presence of sound system in front of the listener, as the brain
registers the changes in sound field with small head movements thus
inducing the listener to use effort to be very still while listening.
Also, too directive speakers, tend to provoke just a few of listening
room’s reflections, making the needed diffuse sound field in room
deprived of high frequency components, which is another problem to our
brain. Real instruments don’t behave that way, so that should be
recreated as mush as possible. 140-15D does just that, it makes almost
semi-spherical sound wave, like life around us does.
Its ability to produce very high SPL with no audible distortion while
keeping the minute music details revealed without any effort, brings
natural character of the instrument played into the listening room,
with such a quality of sound that upgrades the perspective of a
listener to a participant in an event that happened somewhere else in
time and place.
It comes easily for the 140-15D to "fool" the human brain in such a
way that, all of a sudden, makes everything sound right and just as
it should. The brain has no option but to interpret that there are
real living people playing real musical instruments, playing in the
very room in which, a millisecond ago, contained nothing more than
your stereo system. The sensation of hearing "natural" sound is
overwhelming. The exact size of all the instruments and vocals,
their perfect position within the sound stage, and the clarity of
air between the instrument's positions are all instantly
Enough said. You must hear it to believe it.
For measurements, drawings, crossover and more, please download .pdf
FLATFOIL® pure Aluminium ribbon
SYMMLEAD® low inductance signal path
EQUAFIELD® NdFeB magnetic structure
- Special “non-wave-guide” INOX front plate
- Exceptional vertical dispersion
- Super-fast settling time
- Flat frequency response
- Low nonlinear distortion
- High signal power handling
- Highest reliability
- Ribbon material: aluminium
- Ribbon dimensions: ( 140 x 15 x 0.004 ) mm
- Ribbon mass: 0.022 g
- Ribbon area: 21 cm sq.
- Gap induction ( mean value over gap width): 0.51 T
- Frequency response: 500 Hz ~ 100 kHz
- Sensitivity: 95 dB / 1 m / 2.83 V
- Impedance: 8 Ohm
- Program power handling: 200 W*
- *Recommended crossover: 4th order L-R @ 1600 Hz
, are registered trademarks of RAAL
advanced loudspeakers d.o.o.