Most drivers used in hifi are outsourced from specialists.
its the crossovers that a vital and colour what we hear
Most drivers are scandinavian design and made in se asia
Some hifi manufacturers have custom mods made but production runs must be high to cover tooling.
Even ATC now imports speaker chassis from India and ATC was one of the v few 'under one roof providers'.
Roger

518, 568.2, D6Ks, D6KC, iMac dual core, iTunes 10.1 (lossless), Apogee Duet, Kuro 500A, Logic Studio, Sound Devices 702.