The founder of "Audio Research Laboratory" - Prof. Ivan Valtchev (1927 - 2011),
graduated the State Polytechnic - Sofia in 1950. He worked as a designer, technologist and researcher of
electroacoustic transducers in the Weak Current
Plant, Sofia and the Research Institute of Cinematography. In 1975
became Associate Professor at the State Polytechnic; then, since 1984 is
professor of Electroacoustics (electroacoustic transducers) with the
Technical University, Sofia. Retired at 1993 and founded the "Audio
Throughout his active life, he developed electrodynamic speakers and solved
technological problems related to their production.
He created his first high frequency loudspeaker
far ago in 1968. He has developed and implemented in production 12
models of ribbon loudspeakers, for approximately 40 years.
In this not so short time the construction and technology of ribbon
loudspeakers were improved.
Professor Ivan Valchev was president of the
Department of Acoustics at the Bulgarian Federation of Scientific Societies and president
of the Bulgarian section of Audio Engineering Society, USA.
Since 2012 Audio Research Laboratory is running again production of legendary
ribbon loudspeakers NdRL41-MkII and NdRL81-MkII, which are distributed all over the world.