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Uni-Q® driver array technology makes your entire room sound like the "sweet spot" 5-1/4" aluminum cone woofer 1" vented aluminum dome tweeter innovative Metamaterial Absorption Technology (MAT) absorbs high-frequency vibrations to eliminate distortion Driver Performance Optimisation for enhanced sonic performance and reduced distortion frequency response: 79-28,000 Hz (±3 dB) sensitivity: 85 dB impedance: 8 ohms recommended amplifier power: 40-100 watts high-current amplification from a high-performance power amp or integrated amp is recommended for best performance curved baffle design ensures smooth soundwave dispersion with minimal reflection two-way bass-reflex cabinet with patented offset, flexible port for reduced midrange coloration 5-way binding post speaker terminals high gloss finish 7-15/16"W x 11-15/16"H x 11"D weight: 17.2 lbs. (each) warranty: 5 years What's in the box2 Bookshelf loudspeakers 2 Foam port plugs 8 Self-adhesive rubber feet Owner's Manual Warranty Registration Card About this item Written by Crutchfield's Eric AngevineInnovative bookshelf speakers Innovative Metamaterial Absorption Technology (MAT) absorbs high-frequency vibrations to eliminate distortion in KEF LS50 Meta speakers. KEF hit a home run in 2011 when they introduced LS50 bookshelf speakers. In the intervening years, they've learned new tricks that make the KEF LS50 Meta even more impressive.Revolutionary sound absorption This speaker gets the "Meta" part of its name from KEF's new and innovative Metamaterial Absorption Technology (MAT). It's a highly complex, mazelike structure that's tuned to absorb unwanted sound coming from the rear of the tweeter. The resulting sound is clear, purer, and more detailed. Careful cabinet design The LS50 Meta's extremely rigid cabinet uses smooth, curved surfaces that help the sound radiate outward without distortion. It also features a patented offset, flexible port for reduced midrange coloration. As with previous LS50 models, the cabinet use a grille-less design to show off the cool-looking driver array.A room-filling "sweet spot," thanks to Uni-Q® technology KEF's patented Uni-Q technology places each speaker's tweeter in the acoustic center of the bass/midrange cone. This lets the LS50s create a detailed and accurate three-dimensional sound image. This makes the "sweet spot" (the ideal listening position) much larger. Sit wherever you like — you'll have fantastic sound throughout your room.Maximize your listening experience LS50 Metas can deliver truly incredible sound — in the right setup. We recommend 100 watts or more from a high-performance power amp or integrated amp. Proper speaker placement is also crucial to getting the best performance out of the LS50 Metas. Placing them on a pair of color-coordinated KEF S2 speaker stands helps eliminate unwanted vibrations and reflections. Read our article on stereo speaker placement for positioning and set-up tips. And few things add impact to your listening session like solid bass. Add a powered subwoofer to your stereo listening setup for hard-hitting, musical low end.