Ans.
|
| NXT |
| NXT
is a modified cone-type speaker with an associated flat
panel. A conventional bobbin-type driving mechanism
- the same driver principle as that of cone speakers
– pulsates the larger, associated casing. In summary,
the entire assemblage remains a
one-
point driven speaker. When the one-point source drives
the panel, sizable portions of the structure panel cannot
resonate concurrently with the action of the driver
unit. This irregular dispersion is called distributed
movement. Distributed movement is measurable as peaks
and dips in the frequency response of the entire speaker.
This significant dynamic limitation is one that acoustic
engineers and developers endeavor to diminish or
avoid altogether. The
advantage of the NXT "exciter panels" is its
very low cost and thin profile, but the lack of clarity
and bass response has limited its appeal. |
| ELONGATED
CONE SPEAKERS |
| In
theory, the elongated cone shape is the next logical
structure to control –or at least diminish - distributed
movement. While there are fidelity improvements
over the NXT design, mechanical stress and real world
application boundaries limit the true usefulness of
this design, particularly when compared to a traditional
cone-type speaker. |
| ELECTROSTATIC |
| Electrostatic
speakers have an entirely different mechanism of movement
than dynamic speakers, and a simple
statement of physics is useful. "Like" electrical
charges repel one another, and "unlike" electrical
charges attract one-another. A thin plastic membrane
is stretched on a rigid frame, and coated with a low
mass, electrically conductive substance. Two stiff,
flat electrodes, called “Stators”, are given the same
area as the membrane and placed on either side of the
membrane. The membrane is placed exactly equidistant
between the two stators.
The advantage of the electrostatic speaker is
that the entire surface is driven, and the push-pull
operation results in good linearity. However, the complexity
and cost of the high voltage power supply and troublesome
tendency for the diaphragm to "arc", or literally
rattle at high volumes, is a considerable drawback to
this technology. |
| PLANAR
MAGNETIC |
| The
main differences between planar magnetic drivers and
electrostatic drivers are that electrostatic transducers
are “push-pull” devices while planar magnetic devices
are driven from the rear. The obvious advantage of the
planar magnetic transducer is the relative low cost
and no requirement of a special power supply. The disadvantage
of the electrostatic device is the non-linearity of
the device if it is not driven exclusively in a push-pull
manner - and its consequent high distortion. Note that
both technologies suffer from compression of dynamic
range, since the stretched, fixed diaphragms do not
have high excursion potential. In addition, the panels
have to be quite large in order to generate deep bass. |
|
|
|
|
| RIBBONS |
| The
ribbon speaker is another type of dynamic speaker. A
thin strip of aluminum is driven by placing a magnet on each
side of the strip, and the amplifier signal is placed directly
into the aluminum foil strip. This device is limited to high
frequencies above 500Hz and cannot handle high power. |
|
|
|
|
Qs 2. FPS versus
Other Flat Panels? FPS
versus Cone Speakers?
 |
Ans.
Flat Panel Speakers |
| A. |
Sound
wave energies are constantly expanding outwards from our flat
panels.
|
|
| B. |
A
15 degree sound wave spread angle ensures clear and distinct
sounds that travel much further than average cone speakers.
|
| Cone Speakers |
| A. |
Sound
wave energies have a tendency to “clash” and cancel other
at closer distances. |
| B. |
An
average spread angle
of a cone speaker is 45 degrees, thus, it needs major
adjustments in cabinet depth, size, etc. to generate clear
sounds. |
 |
|
|
|
|
|
|
| About
Us | Products
| News | Contact
Us | FAQ
| Purchase
| Warranty
|| Privacy
Policy | ©2001 FPS |
|
|
|
|
