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RE: "removing the front plate with its magnets"?? ...

The 20.7 is also likely to have that cavity resonance as well, but it is probably around the 10khz mark so it is probably there at close mic measurements, however there is a cancellation effect of this resonance as you increase the length of the driver or array of drivers the FR bump from the cavity resonance reduces in size and disappears entirely in a 5 ft driver or array at a distance.

I would not imagine that the tradeoff of less sensitivity and reintroduction of single ended driver compression is worth the gain in resolution and the absence of the cavity resonance. you get by removing the front magnet board. particularly since the cavity resonance peak is cancelled out at listening distance.

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