Thanks for posting this.
I bought a larger subwoofer kit in 1988, after a move to North Carolina. I moved back to California, and replaced the failing woofers with new parts after a trip to see the man himself.
The speaker still sits in my family room. I did modify it with a plate amp some years ago.
Perhaps curiously, the speaker benefits from the advances in digital sound. It is surprising how much low-frequency content comes across on streaming devices.
