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Powersoft amplifies Austrian ‘Wall of Bass’

Powersoft D-Cell504 IS high power amplifier modules have been specified to drive a unique “Wall of Bass” at Club SUB in Wiener Neustadt, Austria.

Powersoft D-Cell504 IS high power amplifier modules have been specified to drive a unique “Wall of Bass” at Club SUB in Wiener Neustadt, Austria.
The club is located in a heavily populated residential area, and wall is capable of reproducing frequencies as low as 7Hz, which placed heavy emphasis on acoustic isolation.

Leading the installation were project managers Wolfgang Sauter from sound reproduction specialists Pro Performance and Reinhard Nell from acoustic experts Lambda Labs. For the “Wall of Bass” 400kg concrete blocks that serve as loudspeaker enclosures were cast and set into a 6 x 3 metre wall, using 13 tonnes of heavy concrete and a further 35 tonnes for the foundation. A self-enveloped 15″ speaker was produced and adapted to the unusual demands of this project. The single chassis are designed to act together like one single swinging wall – in a similar principle to a piston in a cylinder. “A perfect plane wave is created in the interior of the club, which naturally moves along the side walls and doesn’t induce any room modes,” explained Lambda Labs’ German-based director, Steffen Kroschel. “The rear of the main floor was converted into a single bass trap to absorb the incoming wave.” To achieve this optimum performance, each driver was powered by its own dedicated amplifier. Nell chose Powersoft to provide amplification, while Lambda Labs supported the installation with items like amplifier mounting frames. “As we have been using Powersoft amplifiers in our regular self-powered loudspeakers for four years, it was obvious to choose the company again for this project as we have a lot of experience with their modules, such as the Digimod 1500, which we use successfully in our subwoofer product MF-15A and our full range enclosure TX-3A,” said Kroschel. Via their 2-channel 32 D-Cell504 IS amp modules, Powersoft were able to deliver 25,600 watts of power, including 4in voice coils with a custom-made venting system using a hardened membrane. In addition, special mid-high speakers generate a cylinder wave for a longer throw and less room reflections while the DJ reference sound is provided by CX-1A and CX-3A self-powered monitors with Powersoft D-Cell modules. “The data we measured melts in one’s mouth,” said Nell. “The sound pressure level is beyond 140dB and absolutely equal at any point in the room (not that anyone would need such sound pressure levels). And you don’t have the possibility to feel 7Hz throughout your whole body every day.” Kroschel added that everyone who has played through the system has been hugely impressed. “For some it has changed their awareness of music.”