Diatone is indeed a legitimate company. It is a high-end Japanese speaker manufacturer that was founded in 1946 and was a sub-division of Mitsubishi Electric until a few years ago. Diatone has produced some very high-end speakers for NHK broadcasting and Mitsubishi. Many of their speaker designs were later adopted by large corporations such as Yamaha, Matsushita (parent company of Technics/Panasonic), Sony, etc. In 1999, Diatone ceased to exist, but in 2007, it was resurrected by the Diatone engineers. Their first product was the DS-MA1, which shares a lot of the design features of the legendary DS-505 - baton mid-range and tweeter, Kevlar woofer. Diatone is held in high regard and their products are considered to be of high quality. However, replacements for certain parts may be difficult to find.