Overview: The Definitive Technology BPX Full-Range Bipolar
Surround Speaker utilizes state-of-the-art components (high-definition
bass/midrange drivers with butyl rubber surrounds, wide-dispersion pure aluminum
dome tweeters with magnetic cooling fluid, complex Linkwitz-Riley crossover
networks, and a solid monocoque cabinet with a diffraction-less grille/baffle
interface) in order to achieve the most lifelike sound possible in your
listening room. The BPX is a compact, high-quality bipolar (equal sound radiates
both front and rear) speaker intended primarily for use as a rear or side
surround speaker in a Dolby Pro Logic, DSP, DTS, or Dolby Digital surround sound
system. In addition, the BPX can also be uses as a "front effects" speaker in
multi-channel DSP systems or as a front main left and right speaker.
Driver Technology
Enclosure Design
Connections
Mounting Options
Driver Technology
Bipolar Design: The Definitive Technology BPX is a true
bipolar speaker, containing two complete full-range speaker systems; one on each
side of the cabinet. Definitive's Bipolar technology radiates sound from the
front and the back of the speaker for more life-like sound and spacious imaging
for every listener in the room. Bipolar technology combines the performance
advantages of direct radiating (imaging, focus, localization, and specificity)
and dipolar speakers (spacious, all-enveloping ambience) into one ideal speaker
which is perfect for all multi-channel formats. The BPX tremendous dynamic
range, as well as true high-definition sound quality, combined with its bipolar
radiation pattern results in total immersion in the sound field.
High-Definition Die-Cast Basket Drivers: The BPX features
four 5-1/4 inch high-definition cast-basket bass/midrange drivers for
significant performance advantages in the areas of bass reproduction, lifelike
midrange clarity and dynamic range. These sophisticated drivers incorporate
deeply drawn mineral-filled polymer cones, combined with butyl rubber dust caps
and surrounds, high temperature vented voice coils and massive magnet
structures. This combination of features assures high definition, superb
transient response, high efficiency, high power handling and extended linear
response. In addition, the aerodynamically designed, non-resonant,
cast-magnesium baskets minimize reflections of the sound radiating from the back
of the cones and preserve structural and magnetic integrity.
Moving-Coil Pure Aluminum Dome Tweeters: The magnetic
fluid-cooled moving-coil pure aluminum dome tweeters Definitive developed for
the BPX are of a unique design that synergistically brings together the
performance advantages of metal domes (greater clarity) and soft domes (smoother
sound and better dampening) in one state-of-the-art tweeter design. The pure
aluminum dome is specially annealed (to "relax" the crystal structure) and
acoustically loaded by a precisely configured acoustic phase plug/lens (to
assure perfectly controlled, absolutely linear movement). The tweeter's voice
coil sits in ferro-magnetic colloidal fluid which serves to cool the voice coil
for exceptional power handling and also damps the system for smoother response
and sonic accuracy. In addition, the unique silk surround provides better
dampening and wave termination. The audible benefits of all this highly advanced
engineering include smooth extended high frequency response (beyond 30 kHz),
greatly reduced distortion, improved transient response, notably higher
definition, and crystal clear life-like clarity.
Voice-Matched: The BPX is a full-range, extremely linear,
low-distortion speaker which is timbre-matched to blend perfectly with all
Definitive BP and Studio Monitor series speakers as well as other high-quality
speaker systems.
Enclosure Design
Non-Resonant/Low-Diffraction Cabinet: The monocoque cabinet
of the Definitive Technology BPX is constructed of extremely thick, dense medite
with foam damping pads and extensive internal bracing. This virtually eliminates
cabinet vibrations and resonance which would otherwise interfere with the pure
sound produced by Definitive's high-definition drivers.
Connections
Binding Posts: The BPX is equipped with a pair of
gold-plated, 5-way binding posts to attach your receiver's speaker wire.
Mounting Options
Mounting: The Definitive Technology bipolar surround speaker
is designed for easy and unobtrusive placement in your room. It can be mounted
to a wall with the supplied mounting-plate or placed on a shelf or stand for the
ultimate in surround sound realism.
Applications: The Definitive Technology BPX speaker can be
used as a rear or side surround speaker, front effect speaker, or as a front
main speaker.
- Rear or Side Surround: The BPX is designed to be
extremely flexible in terms of their placement when used as surround
speakers. Positioning is non-critical; unlike dipolar surrounds, which are
limited by their specific sidewall placement requirements, the Definitive
Technology bipolar speaker may be located on the sides or rear of the room
(or both as in 6.1 and 7.1 channel installations) or on the ceiling. They
may be mounted on the rear wall (with their front drivers shooting towards
each other and their rear drivers shooting toward the side walls) with
excellent results.
- Front Effects: The BPX is ideal for use a front effect
speakers in DSP installations. The speaker should be placed on the front
wall with the wire terminals against the wall and the speaker separated by
approximately two-thirds of the front wall. Placement above ear level is
also recommended.
- Front Main: The BPX can also be used a front main
speaker due to its superb performance characteristics. In this
configuration, two BPX speakers should normally be placed about 6-8 feet
apart, approximately at ear level, facing toward the listening position.
