SVS PB-3000 vs SB-4000 MONSTER Subwoofer Comparison! - Which Is Better? [4K HDR] - YouTube
SVS - In the recent issue of Germany's most widely read AV magazine, AUDIO, the SVS SB16-Ultra and SB-4000 both reigned supreme in a shootout against all of the other brands available
SVS SB-4000 subwoofer review | Home Cinema Choice
SVS SB-4000 powered subwoofer (Pre-owned) - Norman Audio