flathill wrote:Can't wait to see your field coil induction driver
The challenge is going to be making the adhesive joints at the cone and spider hold up to the heat. Might not want to use adhesive.
I've got some extremely high-temperature exotic adhesive to play with fortunately.
Also, the pipe to cone interface is getting a custom ribbed carbon-fiber backing piece with lots of strong rib-to-aluminum-tube reinforcement joints.
A typical subwoofer may have some extreme X-max value, but with it's pathetic ~2.5-3% efficiency and rather tiny thermal mass and low continuous heat dissipation of the voice coil, you can see once you even reach audible woofer frequencies, they seldom have the power capability to use more than a few mm of the woofers theoretical long-cone-travel capability. This makes all the coil hanging out of the gap in a conventional woofer mostly non-contributing copper loss at any point in it's travel while it's in audible ranges, but marketing huge X-max values sells woofers. lol
This woofer will only have ~+-35mm travel, but the difference is, I will have the power to achieve that travel even up to reasonable sound producing frequencies. No other woofer I've ever seen is capable of doing that, including the beautiful DD Z-series.
The downside, is my woofer construction itself is like maybe 20% of the effort to make it play, the other 80% is in making the custom poly-phase drive system to control it. Fortunately, we live in a world with plenty fast chips to make a position/rate indicating closed-loop-feedback subwoofer drive entirely possible, and it's got the potential to be the most musically accurate system as well as the most power dense by an enormous margin.
I'm simply going to leverage EV controller power-stage setups for my amp, but the control system will be tricky.
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going by that picture it's a very nice looking car 
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