KEF, a high-end speaker maker, has just launched the new LS50 series, which is said to be the first to adopt so-called “special material audio technology” (MAT) and include a model that supports Apple’s airplay 2 delivery. The two high fidelity speakers, the LS50 meta and the LS50 wireless II, have been officially upgraded for more than three years to produce real and natural sound. < / P > < p > the so-called “metamaterial absorption technology” mainly uses a composite material with a complex labyrinth structure, which can absorb 99% of the harmful audio from the back of the driver unit. < p > < p > with the support of mat, the new LS50 series loudspeakers can greatly reduce the distortion. In contrast, the traditional technology can only absorb about 60% of the harmful noise. < / P > < p > it is reported that LS50 meta adopts the 12th generation uni-q driver array and point source configuration, which can deliver high fidelity audio to the whole room. < / P > < p > it includes a 25 mm tweeter unit, an aluminum dome with mat, and a 130mm aluminum cone bass speaker. < / P > < p > the power of the whole machine can reach 100W and can output 106db sound. The rigid box helps to spread the sound without any further interference. < / P > < p > LS50 wireless II is similar to LS50 meta in appearance style, but has some improvement in function. It includes a 100W A / b amplifier for treble driver and 280W class D amplifier for midrange driver, with a maximum output of 108db. < / P > < p > connection options, the speaker provides HDMI earc, fiber optic, digital coaxial, conventional analog input, and Ethernet interface for direct network (or other speakers). In terms of wireless, it supports Bluetooth 4.2 and 802.11ac Wi Fi. Didi Qingju bicycle has entered 150 cities