How many speaker models did Optimus market during the 1970's and 80's? To speak to all of the designs would be foolish. For the most part, however, Optimus and quality are oxymorons.
I can think of no Optimus speaker, from any time period, that could not be bested, and usually substantially, by a less expensive (and usually substantially less expensive) speaker from a better speaker company. Optimus was not a speaker company; they were a brand name placed on merchandise marketed by Tandy. That's a bit diferent than speakers from Advent or JBL during the same time span.