Vienna Acoustics Bach Grand - Symphony Edition Loudspeakers



The aspect of Bach’s mathematically precise compositions that demanded astoundingly inventive solutions to musical problems is fully evident in the Vienna Acoustics speaker that bears his name. The beautiful floor-standing cabinet features Twin Balanced Reflex (TBR) loading of the potent 7” X3P mid-bass driver. TBR combines a conventional rear port with a groundbreaking airflow control port on the front of the cabinet allowing for class-leading bass output and control.

The system provides an extraordinarily compact driver configuration by positioning the refined 1” triple stacked silk dome tweeter directly in front of the port, contributing to a sonic presentation of power and verve that belies the speakers’ compact proportions. This diminutive two-way design joins an assembly for high fidelity that belies its size and price.


$2,500.00 pr (Piano Black, Cherry)
$2,750.00 pr (Rosewood, Piano White)

Specifications:

Tweeter: Hand-coated 1" Silk Dome
Mid-Woofer: 7" X3P Transparent Cone
Bass System: Double Bass Reflex
Bass Function: Impulse Optimizing QB 3 (Quasi Butterworth)

Crossover Components: MKP Capacitors, 1% tolerance
Air Coils, 0.7% tolerance
Metal Film Resistors, 1% tolerance
inductance free
Crossover Function: 2-way 6dB and 12dB Bessel
Impedance: 4 ohms
Frequency Response: 35Hz - 20kHz
Sensitivity: 90dB

Recommended Amplifier Power: 30 - 200 watts
Weight: 80 lbs per pair
Dimensions (W x H x D): 7.4 x 34.6 x 9.8 inches (without spikes), 188 x 878 x 250 mm (without spikes)
Base: Threaded spikes
Optional Base: Optimized aluminum spikes


Completely new for this model in the Grand Series is the development of its 7” mid/bass driver, which uses for the first time Vienna Acoustics’ exclusive XPP cone material for a driver of this size. This was made possible through the material formulation of “X3P” which is a mixture of Vienna Acoustics’ proprietary TPX, the unique thermoplastic used in all XPP cones, and three polypropylene based synthetics (hence X3P), resulting very high inner damping, while providing hugely increased stability and rigidity, which made the bigger cone dimension achievable. Combined with a new inverted rubber surround design that constitutes a breakthrough in no loss damping of cone edge resonances, this new cone material allows the driver to provide an extraordinarily wide bandwidth, while possessing a level of inner detail, quietness, and control that is truly remarkable.

The mid/bass driver benefits from a new inverted rubber surround design and formulation that constitutes a breakthrough in no loss damping of cone edge resonances.

The bass loading system for the 7” driver is also unique, a very innovative design named TBR (for Twin-Balanced-Reflex). This bass system, a combination of front-porting and rear-porting, provides a symmetric loading on the bass driver, thereby completely stabilizing cone movement at the frequency where the driver and porting interact. This allows for effortless airflow control in the full-scale cabinet for class-leading bass output and control.

The front porting of the TBR system utilized in the Bach Grand was adopted from the ground-breaking bass reflex port airflow control wedge found on the Haydn Grand. Not only does this assembly allow for a front port configuration that increases placement flexibility, by virtually eliminating port noise, but it also provides an extraordinarily compact driver arrangement by positioning the tweeter on the front of the wedge. Both features contribute to an unrivaled level of performance in its class. The unique construction works by way of an inner reflex port that vents air towards a wedge positioned at the throat of the port. The cutting-line of the wedge divides the airflow into two streams, which then flow in a specially designed and extensively optimized flare. The relationship of the wedge and the flare is of critical importance, and are precisely determined to achieve

a) maximum bass support for the system, and
b) the reduction of all standing waves in the port (or port noise) by –12dB.

The wedge fulfills additional and very welcome functions in the design. As mentioned above, the large size of the wedge allows the tweeter to be mounted within the throat of the port, resulting in a very compact driver arrangement that improves phase coherency and overall performance by creating a near point-source configuration. In addition, the large internal volume allows for a chamber to vent the back-wave of the driver. To optimally use the chamber, a unique circular back wave pass through slot runs the entire circumference of the back of the driver, as opposed to a central hole. Because of this feature, the specially designed tweeter for this assembly profits from unconstrained air-decompression that approaches the theoretically ideal conditions of free-field construction. As a result, the tweeter dome operates unconstrained, even as it descends into the lower midrange.

The entire assembly is constructed of aluminum, produced by expensive high-pressure die-cast tools.