KRK EXPOSE E8B - Manual (Page 5)

Design Elements
The Enclosure
The contoured shape of the Exposé E8B enclosure creates a striking appearance;
however, its design is every bit as functional as it is beautiful. More rigid than conventional
rectangular designs, it improves the linearity of the bass response, and increases off-axis
response, resulting in a wider sweet-spot. The E8B’s gently curved front baffle and
wide-radius edges reduce the diffraction effects for better imaging.
Cabinet rigidity is extremely important to a loudspeaker’s performance characteristics. A
properly designed enclosure should not resonate and produce its own sound. All sound
should emanate from the transducers and be focused in a single direction—from the front
of the cabinet. With its non-parallel, internal walls, the E8B reduces the chances of
standing waves inside the cabinet. The thinnest point in the construction of the cabinet
walls is 1-inch. Further, the thickness of these walls is continuously variable due to the
curvature of the enclosure’s exterior, which also helps prevent any resonant buildup in the
walls themselves as a result of sound that is being transmitted from the drivers. Further, the
base of the E8B is made from a non-slip, sound absorbing rubberized material that
eliminates vibrations transferring to the surface the monitor is sitting on as well as insuring
the enclosure will not “drift” on its pedestal, or mounting stand.
The Exposé E8B is video shielded to ensure maximum protection against magnetic
interference with video monitors.
IMPORTANT NOTICE: These monitors are heavy! Please use care in handling them and
ensure that the enclosure is placed on a suitable surface capable of supporting the weight.
NEVER TOUCH THE TWEETER ON YOUR E8B MONITORS, AS THIS CAN
DAMAGE THE TWEETER MATERIALS BEYOND REPAIR.
Amplification
As a 2-way design loudspeaker, the Exposé E8B utilizes two discrete, 120-watt (RMS)
Class A / AB power amplifiers. The system runs Class A up to approximately 8 watts (the
crossover point). This is a dual mono system—one amplifier each for HF and LF—
with symmetrical heat sinks built into the sides for cool running,
reliable operation. Special circuitry in the E8B eliminates turn on/off “thumps.”
The Exposé provides maximum circuitry protection against AC power surges, amplifier DC
output, and thermal overheating of the amplifiers.
The Tweeter
The HF tweeter in the E8B is made from beryllium and aluminum in a composite material
known as AlBeMet. The aluminum in this composite helps dampen the metallic
characteristics of pure beryllium. The advantage of beryllium over the more conventional
titanium-type tweeter is very high stiffness to weight resulting in an extension of frequency
response, thus increasing the overall bandwidth of the monitor. The resonances that occur
with beryllium are far beyond the normal human hearing range; hence, this eliminates any
other second or third order harmonic distortion that is audible in the normal listening
registry. Further, the voice coil diameter on this tweeter has been increased, resulting in
improved power handling capability. The resonant frequency has been lowered which
improves the phase relationship.
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