A self-contained, high-output cardioid subwoofer, the BC543 is designed for both permanent and portable ground-stacked applications, offering a high output plus tight and accurate bass response.
The BC543's front and rear located woofer configuration combines with Alcons Digital Drive Processor (DDP) to offer selectable cardioid, low-frequency pattern control and up to 18dB of rear rejection, without any need for additional cabinets.
The unit's front features two state-of-the-art AW18.6NDC/8 18-inch, long-excursion woofers, complemented by a 5.3 inch voice-coil with vented triple-spider frame, Neodymium motor structure, carbon fibre cone and dust cap. The rear features a single AW18.6NDC/8 driver of the same configuration. The extreme excursion capabilities of the design extends the output by 3.5dB compared to traditional 18" woofer designs.
The front of the cabinet features centrally-located X Venting, which takes more than 25% of the baffle surface and is designed to maximise the system's breathing capacity, increasing overall output while minimising port-compression. Meanwhile, the rear features a Flank Venting port, a folded port design which enables optimal reflex-breathing with minimal baffle dimensions.
The combination of complex internal panel layout and extensive bracing means that the BC543 has an exceptionally rigid structure but a relatively low weight. Finished in Durotect scratch-resistant coating and is fitted with 12 handles for ease of transport.
A second version, the BC543i, is designed for installations, so lacks the handles and wheel dolly. Both measure 119.6cm x 59.6cm x 97.6cm.
The BC543 is powered and controlled by Alcons ALC amplified loudspeaker controllers. Via the DDP, the ALCs provide BC543-specific drive processing with response optimisation, dedicated power / excursion protection and hybrid filtering.
(Jim Evans)
