in the early to mid 70's ther was a company called System 360 they created a frequency follower this paired with the Oberhiem SEM Expander Module created the first known guitar synth , the units I saw were sent to a power amp of the day and the speakers were Bose 509's
's because they were advertised as unlimited power rating
the comercial units were all black , the consumer units were wood grained
the comercial units were all black , the consumer units were wood grained