I've been out of car audio for a while. Im curious if BL optimization is still an up and coming thing in car audio. Adire had the xbl^2 which they licensed to RE, TC had their variable wound coils, JBL had differential drive, and a couple others had their own designs Im forgetting atm. I've been looking through this board for a couple weeks now and I don't see anyone mention it or any of these motor types. Im just curious whats happening with them at this point.
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