How many brands use own drivers?


Hello dear Friends. Very interesting question.
How many audio companies are currently presented on the market, which use own developed and manufactured driver units.

Please write bellow:
1. Contrast audio (Ukraine)
2. Voxative (Germany)
3.

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Bose is a fabulous example of an in-house driver as well as incredibly tight alignment with marketting and consumers.

They achieve the magical goal of being extremely inexpensive to produce while giving consumers enough value to merit ridiculous prices for a kitchen radio.
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erik_squires
Bose ... They achieve the magical goal of being extremely inexpensive to produce while giving consumers enough value to merit ridiculous prices for a kitchen radio.
That doesn't make sense. If the product gives consumers "enough value," then the price can't be "ridiculous."
Vandersteen carbon drivers. Thiel made their own drivers. TAD and Vivid probably do.