any info on Petroff Labs full range speakers?

What information are you looking for?

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.

http://www.trademarkia.com/petroff-labs-73313299.html

The principal seemed to be one W. Edward Johansen, who now runs or works for Mama Records as per this entry:

http://www.logosdatabase.com/logo/mama-records_75466268

Which seems to be a jazz specialty record company:

http://www.mamajazz.org/

Is that what you wanted to know, or did you want to know something else?

It looks like W. Edward Johansen ran Petroff. You may want to email Mama Jazz? Maybe W. Edward Johansen would be willing to answer your questions.