The claim is utter nonsense.
Throughout nearly the entirety of its life Bozak solely used speakers manufactured in its facility. At the very end of the company's existence it switched to Audax tweeters. No evidence has ever been presented that any other driver was ever used by mainstream Bozak. When the company was broken up, into parts and the name, the name was sold and other modern drivers were used before Bozak ceased to exist. But never Wharfedale drivers.
Wharfedale drivers, furthermore, were designed for stiff and heavily damped. i.e. sand-filled, bass-reflex or ported cabinets. While such drivers could be used in infinite baffle, the loss of the backwave would greatly reduce the SPL.
The appearance of a Wharfedale drivers most likely arose because a Bozak cabinet was populated with Wharfedale drivers. The conclusion that this meant the factory installed such drivers is as ridiculous as the claim that because a Radio Shack driver appeared in some other speaker that the other manufacturer used Radio Shack drivers.
