The Rogers AB3a is an active subwoofer system specifically designed for use with the LS3/5A or similar small monitors. Each subwoofer is configured as a matching stand for the LS3/5A, finished in satin black and houses a fifty-watt amplifier. The amplifier drives two mass loaded LS3/5A woofers housed in a closed box system. The amplifier is adjustable for gain, frequency cut and phase response, allowing for optimum low-frequency alignment and room placement. UK Retail price is £3,499.00/pair.