Replacing the popular R505, the REL Acoustics R528 subwoofer speaker is the ideal add-on for any home entertainment system. Designed for the consumer who wants serious levels of bass, this subwoofer speaker with an integral REL-designed Class D 500-watt amplifier will reach down to a mere 21 Hz at -6 dB. The REL Acoustics R-series subwoofer is driven by a 305-mm (12-inch) long-throw bass unit constructed on a solid steel chassis and it has a passive 305-mm (12-inch) carbon fibre VariCone through which the sounds escape. The REL Acoustics R528 has three controls to the rear for level, extreme low-frequency level, and crossover frequency for fine adjustment to suit the listener’s room. This REL Acoustics R-series subwoofer has a variable crossover from 30 Hz to 120 Hz. The input signal can be from a Neutrik ‘Speakon’ for high-level input or an RCA phono for low-level input. This REL Acoustics R-series subwoofer measures 394 mm (15.5 inches) in height by 445 mm (17.5 inches) in width by 437 mm (17.2 inches) in depth.