Back in the late 70's, early 80's I worked in the audio business and back then there were over 500 loudspeaker manufacturers just in the U.S. Back then, it was a "high profit margin" part of the audio business, I'm not sure if that's changed or not.
I suspect that most manufacturers either use "off the shelf" or "made to spec" drivers from other firms, and combine those with cabinets, crossover circuits, grills and other components they might make in house, from parts they also purchase from outside suppliers.
Automobile manufacturers have used this model for decades.
I wouldn't claim that a manufacturer who constructs all the components of a speaker is superior to one that does not, on those merits alone.
I suspect that most manufacturers either use "off the shelf" or "made to spec" drivers from other firms, and combine those with cabinets, crossover circuits, grills and other components they might make in house, from parts they also purchase from outside suppliers.
Automobile manufacturers have used this model for decades.
I wouldn't claim that a manufacturer who constructs all the components of a speaker is superior to one that does not, on those merits alone.