series of loudspeakers using the Smooth Frequency Response
technology. SFR ensure a low frequency response with the smallest slope
of bass characteristic, similar to transducers curve. SFR
minimizes self-resonances related to the dimensions of the
baffle. It releases
room standing waves, compensated by the dipole propagation of low
frequency. Room Gain Control system allows to obtain even
characteristics, regardless of
size or shape of the listening room.
open baffle loudspeakers system, with a passive filters, realize a
bass roll-off with minimum phase shift. Low-pass filter compensates for
the open baffle through characteristic with the same slope.
is possible to linear sound reproduction from lowest frequency band,
assuring a bass tone with the correct timbre.
with dipole nature of sound propagation, excite room
resonances in a limited range, which for a low frequency it causes
strong surge of loudspeakers-room characteristic. It is very difficult
to remove resonances in the listening rooms. The bandwidth of room
resonance is small, of row a few Hz, which makes it difficult to
operate the acoustic equalizers or passive bass traps. The quality of
sound reproduction through the loudspeakers with omni-directional bass
radiation pattern is related to the dimensions and shape of the
listening room. The dipole design doesn’t have such
disadvantage, the room resonances occur on minimum level, regardless of
listening position. In the result there is even sound distribution
throughout the room space, devoid of the bass dominant.
Loudspeakers drivers work
in the open baffle at the lowest damping factor. Pulse characteristics
are at the highest level. Lack of closed air volume inside of
resonant elements causes a correct transient response.
loudspeakers are a combination of classical design loudspeaker of a
narrow dimension with advantages of the open baffle. Loudspeakers have
while retaining the equivalent of a large baffle width. They represents
acoustic system in open, non-resonant technology with dipole nature of
sound propagation, in which the radiation of rear side
cone is obtained by a slit or aperture in back side of enclosure. The
SFR technology (Smooth Frequency
Response) allows to create the open baffle loudspeaker with a low
frequency range and high efficiency, without adverse effects of
classical large, flat baffle design. The acoustic
slit provides a symmetrical dipole nature of the low frequency
propagation, limiting the adverse room resonances. The width
the slit and resulting acoustic impedance is matched optimally, volume
of air inside does not affect the transducers parameters.
The interior doesn't require additional dampening of soft materials.
The SFR open baffle technology reduces
a wide spectrum of negative acoustic interactions with the room. The
advantage is an accurate and coherent reproduction of the sound image
for each of the ranges in terms of spatial and stereo.
Generally in JAF loudspeakers there are applied four dynamic,
full-range transducers transforming
frequencies of low and medium tones. It is a
benefit due to the low value
of the cone mass. A proper
pulse answer and the correct transients reproduction are the advantage.
High frequency range supports the magnetostatic transducer. It is
characterized by a large surface and low mass of diaphragm. The result
is a wide directivity and high sonic resolution. All transducers
determine the concept of low mass and large cone surface. The result is
a small excursion, limiting the distortion related to the non-linear
work of suspensions.
The JAF crossover filters represent the general
nature of the first order. Detailed characteristic is tune up to the
open baffle technology with acoustic slit. Optimization of crossover
filters is related to slope characteristics, compensation of the open
baffle efficiency, baffle step effect, linearization of loudspeaker
coils inductance. Using the first order passive filters in the open
baffle design, compensates the phase shift at low frequencies. Thus it
is possible to obtain a linear reproduce from the lowest band
frequency, providing high fidelity bass tones.