They were ostensibly speakers made by Petroff Labs, an unremarkable manufacturer which operated between 1981 - 1984 from Simi Valley, California. Not long enough to really be otherwise remarkable.
The principal seemed to be one W. Edward Johansen, who now runs or works for Mama Records as per this entry:
Which seems to be a jazz specialty record company:
Is that what you wanted to know, or did you want to know something else?