I developandfinishedspeaker systemsandacousticconcepts forcompaniessuch asAudi,BMW,Daimler,Foster,PSS,Lufthansa Technik,Pagani,Blumenhofer,ConsequenceAudio,Sonus Faber,LOEWE,monitordb,Duravit,Hager,Berker,Fendtand many others.... FYI all speakers ( you see ) I develop and manufacture myself, ESL, Dynamic, Isodynamic, Ribbon, AMT's etc. ....