Tributaries - SP614F-BK02S - Bulk Speaker Cable (Spool) Tributaries SP614F 14/2 that constructed with High Conductivity Oxygen-Free (HC-OFC) copper in a UL rated black flexible PVC jacket. With a paintable black jacket, this cable was specially engineered as a flat speaker cable meant to be installed under carpets or baseboards. It is available in 50.0' (15.2m) or 200.0' (61.0m) spools.