Usher Audio speakers and electronics are built for the experienced
listener who won't compromise on sound quality even at moderate prices.
The stand-mounted Be-718s–the Tiny Dancers–features Usher’s 1.5-inch
Be beryllium dome tweeters and carbon-impregnated paper-cone midbass
drivers.
The Be-718s fills even medium-large rooms
with impressive musical dynamics; the integration, speed and clarity of
its drivers are exceptional. Expansive, quick upper frequencies are
redolent with harmonics for rendering female vocals or the quick
shimmer of brass.
Our Be tweeters uncover low-level details usually lost in the noise
floor of less resolving speakers. Dr. Joseph D’Appolito serves as
Usher’s technical consultant, providing guidance in crossover design.
The result is powerful, transparent sound from well-crafted and
finished cabinets at very affordable real-world prices.
The Be-718s, like all Usher speakers, are produced with skill and pride
in an ultra-modern factory in Taiwan with great attention to
manufacturing efficiency and productivity, turning out speaker systems
incorporating advanced technologies like the Be beryllium midrange
drivers found in the floorstanding Dancer Be-10 and Be-20.
Usher has been producing speakers in Taiwan for more than thirty years,
and makes a number of specialized in-house drivers featuring Be
beryllium ceramic diaphragms. These are created by heating beryllium
formers to greater than 700 degrees, transforming them into brittle but
extremely high-strength beryllium oxide. This ceramic’s enormous
strength-to-weight ratio pushes the Be dome tweeter's transient
response to an extraordinary level while minimizing distortion.
The Be tweeters&Mac226; upper-frequency response is focused and
dynamic. Some manufacturers run their beryllium tweeters above 30kHz
because they can, but research with the standard-setting Klippel
R&D System that dynamically measures non-linear motion clearly
shows that running beryllium tweeters out to almost 40kHz causes
break-up distortion. Usher’s Be tweeter operates up to 30kHz
eliminating the dual resonance points most beryllium tweeters are
saddled with.
As a cost-cutting measure some manufacturers specify a voice coil
that’s smaller than the dome it drives, but that creates resonance and
distortion. Usher uses a full 1.5-inch voice coil driving the diaphragm
close to its outer edge for better control, higher velocity, and power
without break-up distortion.
Symme-Motion Technology Explained
Usher’s
Symme-Motion technology–applied to all Usher drivers–symmetrically
locates the voice coil within each driver’s magnetic field
“linearizing” the motor’s movements. That is to say, when applying
positive voltage to the cone moving it outwards, it moves backward in
an exactly symmetrical way when presented with the same negative
voltage. Symme-Motion ensures the voice coil remains exactly centered
within the magnetic field.
Usher ensures optimal
symmetry and linearity as individual drivers and paired speakers are
closely toleranced to within 0.2dB sensitivity for stereo pairs.
Another element of Usher’s driver designs are the selection of
materials and the design of the supporting basket or spider. Without
careful engineering the baskets may act like springs and cause
non-linearities in the output. Even the driver surrounds are designed
to absorb vibrations that might otherwise reflect back into the cone
resulting in further non-linearities.
Source: Press Release
