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Home › News › Subwoofer 101 - PB-16 ULTRA AND SB-16 ULTRA SUBWOOFERS Subwoofer 101 - PB-16 ULTRA AND SB-16 ULTRA SUBWOOFERS Posted by Nick Brown on August 08, 2017 http://www.subwoofer101.com/pb16-ultra/ 2017, August-2017 icons/instagram Created with Sketch. Share Share on Facebook Tweet Tweet on Twitter icons/pinterest Created with Sketch. Pin it Pin on Pinterest