ResourcesForLife.com/audio Audio Subwoofer Review. SVS: SB12-NSD and Klipsch: R-12SW. (7 Mar 2018) — Note: The SVS subwoofer comes with a grounded power cable, but has only a two conductor connection to the subwoofer. Also, the ‘hum’ described in the video, went away later. It seemed to be caused by not having RCA cables attached.