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Overview: The
Definitive Technology BP7004 SuperTower is a bipolar tower loudspeaker with a built-in
powered subwoofer intended for musical
reproduction and home theater systems. This full-range bipolar (front and rear)
radiating tower loudspeaker combines spacious soundstaging, lifelike
depth-of-field, accurate resolution, and pinpoint imaging with extended bass
response, high-efficiency, wide-dynamic range, and easy-to-position convenience.
The BP7004 features front and rear mounted driver arrays, each consisting of one
high-definition cast-basket 5-1/4" bass/midrange driver and a 1" annealed Pure
Aluminum dome tweeter. The BP7004 also combines a built-in 10-inch subwoofer
driven by a 300-Watt class D amplifier and two pressure-coupled 10-inch low bass
radiators for 235 square inches of bass radiating area. That is nearly as much
surface area as a single 18-inch woofer; but with better control, speed and
detail. Built-in powered subwoofers achieve dramatically better blending,
integration and timbre accuracy than could ever be achieved with separate subs.
A Linkwitz-Riley crossover network seamlessly blends all the speaker's drivers
together. The bipolar tower speaker's slim designer enclosure
takes up 6
tenths of a square foot of floor space.
Driver Technology
Built-In Powered Subwoofer
Enclosure Design
Connections
Mounting Options
Driver Technology
Bipolar Design: The Definitive Technology BP7004 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 BP7004's wide dynamic range,
as well as true high-definition sound quality, combined with its bipolar
radiation pattern results in total immersion in the sound field.
Moving Coil Pure Aluminum Dome Tweeters: Each
Definitive Technology BP7004 utilizes two annealed pure aluminum 1-inch dome tweeters
(one on front-side/one on back-side), suspended by a silk surround and
acoustically loaded by a precisely configured phase plug/lens; engineered to
assure perfectly controlled, absolutely linear movement. This results in smooth
extended response (up to 30 kHz), greatly reduced distortion, improved transient
response, wider dispersion, and notably higher definition. Magnetic fluid
damping is incorporated for ultra high power handling.
High-Definition Die-Cast Basket Drivers:
Each Definitive
Technology BP7004 utilizes two 5-1/4 inch high-definition bass/midrange drivers
(one on front-side/one on back-side) for significant performance advantages in
the areas of bass reproduction, lifelike midrange clarity, and dynamic range.
These sophisticated bass/midrange drivers incorporate deeply drawn
mineral-filled polymer cones, combined with butyl rubber surrounds and dustcaps,
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 bass response. In
addition, they are assembled utilizing an aerodynamically designed, magnetically
inert, cast-magnesium basket to minimize internal reflections off the back of
the cone and preserve structural and magnetic integrity under all conditions.
Phase-Coherent Crossovers: Definitive
Technology's complex and sophisticated Linkwitz-Riley crossover networks are
differential crossovers which equalize the front and rear drivers of the speaker
separately for both linear frequency and phase response of their summed output.
Also included are advanced technology Zobel Networks which provide a more stable
load for your amplifier. This makes the speaker easier to drive, which results
in smooth, more natural sound. In addition, the electronic crossovers in the
subwoofer modules work together with the Linkwitz-Riley networks to perfectly
blend the subwoofers with the bipolar arrays. The result is sonic perfection
that completely preserves the phase coherence, transient response and dynamic
integrity of the original signal.
Break-In Period: The BP7004 will sound good right out of the
box; however, an extended break-in period of 40-60 hours or more of playing is
required to reach full performance capability. The break-in period allows the
suspensions to work in and results in full bass, a more open midrange, and
smoother high frequency reproduction.
Built-In Powered Subwoofer
Powered Subwoofer: Besides
eliminating the need for additional floor-space and a separate subwoofer,
integrated subs offer dramatic performance benefits, such as being
perfectly blended with the midrange and high frequency section of the speaker.
Plus, you have two subwoofers to help minimize the detrimental effects of room
conditions, so you typically get a smoother response than you would get with a
single separate sub. Each BP7004 features a single 10-inch long-throw
subwoofer that is powered by a built-in 300-watt Class D amplifier and
pressure-coupled to two 10-inch low-bass radiators on the opposite-side of the
cabinet for a total bass radiating area that is almost greater than a 18-inch
woofer; but with far greater control, definition, and speed. A pair Definitive
Technology BP7004 is like having two 18", 300-watt powered subwoofers in your
room without taking up anymore floor space. The result is bass that is deep,
powerful and impactful while at the same time having tight, controlled, and
accurate response. The built-in powered subwoofer also provides the following
features.
- Auto Turn-On: The BP7004's built-in active power
subwoofer section must be plugged into an electrical socket using the
attached AC cord. The BP7004 has a special circuit which automatically turns
the powered subwoofer section on when a signal is fed to the loudspeaker and
turns off when there is a no signal (for 1-hour).
- LED: An LED on the back-panel will light up when a
signal is sensed and the amplifier turns on. The LED will automatically
turn-off when there is no signal (for 1-hour).
- Built-In Crossover: Definitive's engineers have
perfectly adjusted the crossover and phase between the subwoofer and main
speaker sections of the BP7004 to achieve seamless blending and life-like
sound.
- Note: Please not that there are no controls to vary
the crossover points or phase because these have been factory calibrated
and set to provide perfect blending.
- Level Control: The BP7004 has a bass-level control
which allows you to tune the output level of the built-in powered subwoofer
section to match your room and personal listening preferences.
- Protection Circuit: To prevent accidental damage to the
subwoofer built-in the BP7004 from overdriving the system, the built-in
powered subwoofer section features an internal overload protection circuit,
which will turn the powered subwoofer off or down when overdriven or
overheated and will then resume normal operation after a few minutes.
Enclosure Design
Narrow Non-Resonant, Low-Diffraction Cabinet: The tri-chambered monocoque cabinet of the Definitive Technology BP7004 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. The driver placement of the BP7004 reduces
diffraction to an absolute minimum by flush mounting drivers on extremely narrow
baffles with radial edges covered by a frameless grille "sock." The narrow
cabinet also dramatically improves three-dimensional imaging.
Connections
Speaker-Level & Line-Level Connections: Each Definitive Technology BP7004 is equipped
with a pair of gold-plated, 5-way binding posts to attach your receiver's
speaker wire and a gold-plated, mono-RCA/LFE input to connect your receiver's
LFE/subwoofer output.
Applications: The precise accuracy, wide-range response, and
high impact dynamic range of the Definitive Technology BP7004 allow you to use
the speaker in most home audio/video system's ranging from a 2-channel
music-only to a 7.1 channel home theater system. When used as a stereo pair,
simply connect it with speaker wire as one would any pair of speakers; there is
no benefit to using the low-level LFE inputs. When using the BP7004 in a
multi-channel system there are two options.
- Speaker Wire Only: Connect speaker wire as in a stereo system;
set bass management as Front=Large, Subwoofer=None
- Speaker Wire + Subwoofer Cable: In addition to speaker wires
connect low-level cables from the LFE/Subwoofer output of the
receiver/processor to the LFE inputs of the STS (Y connector is usually
required). Set bass management as Front=Large, Subwoofer=Yes. The benefit of
this hook up method is that one now has the ability to control the level of
the LFE channel relative to Front L&R bass.
Mounting Options
Placement: The Definitive Technology Bipolar SuperTower speakers are easy to hook up to your system,
simple to place, and flexible in terms of room positioning. They are engineered
to be located as close as 5" or as far as 36" from the wall. The mirror-imaged
side-mounted subwoofers can face either toward or away from each other for even
greater flexibility and room tuning ability. In addition, a major benefit
of the special driver topology is wide-dispersion, which assures a superb
panorama of lifelike sound for every listener in the room wherever you put them.
Adjustable Feet: Each Definitive Technology BP7004 comes
with four plastic-tipped feet for placing the tower speaker safely on your
hardwood floors or tile, and four spiked-feet for placing the tower speaker
securely on your carpet. The adjustable feet help you level the speaker on
uneven flooring. In addition, each BP7004 comes with
a pair of rear-stabilizer feet to help stabilize the speaker even further.
