I had a similar idea, but with series power-of-two weighted coils replacing the normal single speaker coil on a speaker cone driver.
I knew instinctively it wasn’t practical, and never tried to patent it. Also I didn’t have anywhere near the resources necessary to do so, at the time.
Undoubtedly many others had the same idea, at the time.
Bell Labs had lots of money at that point in time. I was with Pacific Telephone through divestiture, then Pacific Telesis until Nov 1991. The MBAs talked the company into dumping the 5,000 employee software support part of PacTel. In short order they were unable to perform in 180 of 360 projects underway. Eventually they were swallowed up by SBC. It was clear there was no future after the bloodletting. I had a written offer from my current employer hand delivered in Nov 1991. A simple decision. Approaching 33 years in December.
One of our other luminaries at PacBell was Scott Adams. He did just fine exiting for a new career.