The A2 is the second floorstanding speaker of the ACT line. It keeps the elegance of its little sister,
the A1, in a cabinet that is not much bigger in size.
It delivers a very dense and lively sound with a beautiful sound stage so characteristic of the ACT
line.
This 3 ways, 3 drivers loudspeaker offers excellent sensitivity. It is not too demanding and can
adapt to just about any kind of amplifier with high musicality.
The ACT line
With the ACT line, BC Acoustique wan ted to create s peakers with
a pure and sharp design using advanced technology.
The ACT speakers are the result of several years of research and
development. Looking at their fine design, i t is hard to realize th e
efforts that went in the ma king of the speakers and the level of
technology that can be found inside. The result is quite an
achievement.
Three specific technical aspects were particularly studied:
Internal resonance modes
Phasing
Distortion level
These three aspects are ofte n weak points on speakers fo und on
the market, and this for a simple reason: the measuring devices
used in the world of electroacousti c do not offer the necessary
precision to clearly show some important phenomenon for which
the human hear is highly receptive.
With this in mind, BC Acoustique decided to develop its own set
of measurement devices and to adapt its manufacturing process
and testing facilities to these innovative techniques. These
devices give our engineers a higher precision in their work,
making this a significant progress in the field of electroacoustic.
These technical evoluti ons ma ke th e ACT line an accomplishment
with remarkable sound qualities. No place was left for luck.
But we always kept in mind that the final goal of all these
evolutions was to make sure that the listener would forget all the
technical aspects and enjoy the best of what music and sound
can offer. This is BC Acoustique’s philosophy.
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The Tweeter
The A2 uses 3 drivers. For the treble BC Acoustique chose a BC100 horn
tweeter. A common model to all ACT speakers, this tweeter is the result
of an important collaboration with Fostex, one of the most prestigious
high end drivers’ manufacturer.
Compared to a classic dome tweeter, the BC100 brings a remarkable
definition of higher frequencies, an incredible clarity, efficiency and
good transiency.
Its frequency response chart is regular up to 50 kHz for an ideal
transcription of high definition sources (SACD or DVD-Audio) without
the inconveniences that can be found with super tweeters.
The BC100 can also reproduce all the dynamic that you can find in
music or movies without any loss or distortion.
Titanium Dome, rigid and light
for a fast step response
Aluminium horn with a profile
developed to improve frequency
response linearity, ease the phase
coherency and limit directivity
A large double magnet gives
A Ferrofluidated moving coil
lowers the resonance
frequency and increases
power handling
the motor power and speed
The compression chamber
optimises the acoustic
impedance of the sound
wave
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The Bass-Midrange
The A2 uses 2 18cm drivers for the midrange and the bass. Both were
conceived in cooperation by BC Acoustique and the renown Norwegian
drivers manufacturer SEAS.
Each of the 2 driver is used differently. One is in charge of the bass down
to 300Hz, the other one is in charge of the medium range.
This allows the A2 to have deep bass that is steady but never covers the
openness and clarity of the midrange. Voices are warm and precise while
the tones are reproduced with a seducing richness.
The use of a Polypropylene diaphragm with
variable thickness makes an excellent
compromise between lightness and rigidity.
Damping has been particularly studied to
Rigid basket with a very
open rear side to
reduce the disturbing
primary reflections
Spider was specifically
studied to offer a
perfectly symmetrical
movement
Cone profile and suspension
specifically designed for a steady
frequency response with no
accidents. This allows the use of
slow slope crossover for higher
phase coherence
Large magnet for more power
handling and high efficiency
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Moving coil naturally
ventilated and cooled. It can
reach high acoustic pressure
with very low distortion rate
The Crossover
The crossover of the A2 was designed with components selected for their top quality. The
state of the art connectors come from WBT renown for their mechanical and electrical
performances. The terminal allows bi-wiring. . Internal cables all come from Tara Labs, a
leader in cable technology.
Even if its architecture is complex, the crossover is using only a fairly slow first order slope of
6dB/Octave. This solution preserves the phase of the drivers and the coherence of sound.
To make the ACT line easy to adapt to a room, the use of a number of specific resistors allow
the auditor to change the level of the tweeter. 5 positions are available to increase or reduce
the tweeter level by up to 3dB. It will be simpler to adapt the speakers to the listening
conditions of the room and to the other components of the Hifi/AV system.
WBT Bi Wired terminals
Those small details…
The front grilles are made with removable
fabric that can be changed. A magnetic
system of fixing uses powerful neodymes
magnets inserted inside the cabinet and
the grille. Thus the fitting is always perfect.
The use of magnets has absolutely no
effect on sound.
On the contrary this solution does not use
the usual plastic pins that create problems
of reflections and disturbances on the
frequency response.
If you do not want to use the front grille,
you can also easily put it on the back of
the speaker where other magnets have
been inserted. This way it will be easy to
put away. There will me no mark of plastic
pins on the front panel to taint the design
of the speaker.
The A2 are delivered with specific feet to
obtain a perfect stability and a
mechanical decoupling to isolate the
speaker from the floor and eliminate
Wide tracks circuits
Usaturated
Inductors coils
High power
ceramic resistors
Polypropylene
Capacitors
Non inductive
resistors
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The Woodwork
The woodwork for the A2 is made out of high density 30mm thick MDF. All wood panels are veneered on both sides to avoid
any risk of bending of the wood on the long term.
The internal architecture is quite complex, using diffusors and resonators, inclined panels and stiffening pieces for the cabinet.
These solutions eliminate all sound coloration and resonances. The speaker gains in neutrality and clarity.
The A2 uses a bass reflex solution. The tuned vent, whose position in the cabinet was carefully studied, is used to increas e the
energy level but also to get rid of one of the resonating frequency inside the cabinet.
Damping material has been carefully chosen and is used in strategic places to cancel unnecessary internal frequency waves ,
this without affecting micro information.
The drivers are mounted in a very specific way to conciliate acoustic and mechanical
benefits while giving the speaker a unique design.
No screw is seen from the outside on the front panel, as the drivers are held from the
inside. The outer aluminium ring allows a very tight and homogenous fixing of the basket.
It facilitates the flow of unwanted vibrations and its curved profile limits the creation of
reflections on the outer rim of the basket.
Stiffening pieces
Bring more rigidity to the cabinet and
suppress stationary waves. Thorough
studies were done to find the best
setting in the speaker for these
Diffusors
They break the sound waves
to avoid any echoing inside
the cabinet. These do not
affect all micro information.
Inclined panels
Limit the stationary waves.
Resonator
This independent compartment was
designed to absorb unwanted
frequencies. The A2 incl udes 3
resonators
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Quality Control
The A2s are carefully hand made in BC
Acoustique’s factory. All drivers are tested,
selected, ran in and paired..
Crossover is set precisely to compensate potential
variations in one or more components. Each
speaker is thoroughly tested and measured. It is
then compared to the standard measurements.
All these information are recorded and stored in
our data base to guarantee the quality of
technical service for each speaker that we
produce.
Drivers
Tweeter
Midrange
Woofer
Terminals
Crossover
Horn BC100
18 cm polypropylene
18 cm polypropylene
WBT - Bi-wi r ing
6/18 dB at 3,5kHz
12/6 dB at 300Hz
Finish and Accessories
The A2 are available with 4 different finish :
Wengé, Amarante, Maple, Cherry (from left to right).
They are delivered with a box of accessories including handling
gloves, a soft rag, a bottle of cleaning lotion, a test CD that will
allow you to set your installation and improve the run in of your
speakers.
The A2 as well as all BC Acoustique’s speakers have a lifetime
warranty (see conditions).
Performances
Frequency Range (+/-3dB)
Distorsion
Maximum long term power
Maximum short term power
Sensitivity (2,83v/1m)
Nominal Impedance
Minimum Inmedance
Specifications
Type
Dimensions (HxWxD)
Weight
Cabinet
Diffusors
Résonators
www.bc-acoustique.com
44Hz - 50kHz
<0,8%
120 Watts
250 Watts
91,0 dB
4 Ohms
3,6 Ohms
Bass-Reflex Floor standing
100 x 22 x 36 cm
38 Kg
MDF HD 30mm
YES
YES - 3
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