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 Wireless Subwoofer for HT-A9 & HT-A7000 Wired & Wireless 300W NEW | eBay
Sony HT-A7000/SA-SW5/SA-RS5 Home Theater Bundle Powered 7.1.4-channel sound bar, subwoofer, and rear speaker system with Bluetooth®, Apple AirPlay® 2, Dolby Atmos®, and DTS:X at Crutchfield