Darius amplifiers were made in the 1970s by Arc Musical Instruments, a division of Ahed - a Canadian company owned by Phil G. Anderson. Ahed was established in 1969 and became the Eco Corporation in 1978. There was a complete range of Darius amplifiers and PA systems ranging in price from $40 to $600 (in 1972). The Darius guitar and bass amp heads are immediately recognisable by their bright colored face plates - the 1000 series had orange face-plates and the 2000 series had lime green.

Source: Darius catalog 1972

Source: Ahed wiki page (8 March 2017)