KEF E305BL 5.1-Channel Speaker System - Black Features KEF's patented 4.25" Unit-Q Driver which spreads sound over a wider, even area so you and your guests can experience amazing sound quality anywhere they sit. E-2 subwoofer delivers agile extended bass response without overhang - fast, punchy and well defined, seamlessly integrates with the matching satellite speakers. Black finish is complemented by cast aluminum bases that simply rotate to form wall brackets. Beautifully engineered bespoke stands are also available (sold separately).