Loudspeakers have been commercially available for nearly a century, yet those whose drive-units are mounted to baffles of intentionally limited width didn't appear in significant numbers until the 1980s. That seems a bit strange, given that the technology to transform large boards into smaller boards has existed since the Neolithic era.

The tale's been told many times: Back in the early 1970s, the British Broadcasting Corporation needed a small nearfield monitor for use in remote-broadcast trucks. A team led by T. Sommerville and D.E. Shorter, both of the BBC's Research Department, developed the two-way, sealed-box LS3/5, based on a small monitor they'd designed for experiments in acoustic scaling. The speaker showed much promise, but problems with the drive-units—a woofer with a doped Bextrene 5" cone and a 1" Mylar-dome tweeter—led to a detailed redesign, the LS3/5a, carried out by Dudley Harwood, also of the Research Department (and later to found Harbeth), and Maurice E. Whatton and R.W. Mills, of the BBC's Designs Department.