SVS PB-4000 DO YOU REALLY NEED DUAL SUBWOOFERS?!? - YouTube
SVS PB-4000 Subwoofer Review | AVForums
SVS PB-4000 (Black Ash) Powered subwoofer with app control at Crutchfield
SVS PB-4000 Subwoofer Active Ported 13.5" 4000 Watts Sub Gloss Black Ash | eBay
SVS PB-4000 Ported Subwoofer Review | Audioholics
SVS on Twitter: "Biggest SVS event ever at @nfmtweets tonight! Getting the dual PB-4000 subwoofer & Prime Speaker system warmed up. https://t.co/141vOAVJIF" / Twitter