KEF Commercial Series. 4.5in. LF driver, 19mm tweeter. Uni-Q Array, KEF Commercial Series. 4.5in. LF driver, 19mm tweeter. Uni-Q Array, UL2043 & UL1480-5 approved, 70V: 4W 8W, 15W, 30W / 100V: 8W, 15W, 30W Fire rated metal rear enclosure, May ON SALE - Up to 72% OFF