PS 10 speakers

Many years ago when I was in college (early 80's - first time) I owned a pair of speakers called PS-10's. They were a 3 way system with a down-firing woofer. The thing that made these speakers unique at the time was that they were only about 12" square. They also made a PS-8 (with 8" woofer), and a PS-6 (2 way bookshelf). Does anybody remember these speakers? More important, does anybody know who made them and are they still in business?