The Polytone speakers of that era were made for them by Eminence. These drivers had a light-weight cone, which broke up easily giving some harmonic distortion (and the warm sound!). The speakers also had fairly small magnet assembly. Inexpensive speakers that had a characteristic sound.Bob,
Do you suppose that they made that particular speaker for Polytone? I believe that that was the case for the early GK 200MB's. Just a thought.
Ric
The OEM driver for the GK 200MB was made by Pyle. The driver for the current GK MB150 is made by Eminence. I've had a Pyle and an Eminence version in two identical cabinets, and I could not tell any difference between them.