I enjoyed the deep bass with the subwoofers 'SA-SW3' and 'SA-SW5' that can be incorporated into Sony's audio system without any settings. - GIGAZINE
Sony SA-SW5 - Subwoofer con tecnología Separated Notch Eddge, Negro : Amazon.es: Electrónica
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Sony HT-A9/SA-SW5 Home Theater Bundle Home theater speaker/subwoofer system Dolby Atmos®, DTS:X, Bluetooth®, Apple Airplay® 2, and Chromecast built-in at Crutchfield