Well, it’s a pretty crowded business these days, but KEF, the U.K.-based company launched in 1961 by ex-BBC electrical engineer Raymond Cooke, has chosen to enter the headphone market now with two “M” series headphone models – the M500 over-ear model and the M200 in-ear model. Now over 50-years old, KEF (Kent Engineering & Foundry) has a long history as a respected loudspeaker innovator. These are, however, their first headphone designs.