My search for applications of such a concept have led me to patents
and patent pendings, but not to actual products.
The concept that you mentioned, of tapping across the active driver's
voice coil and filtering the (power) signal information to the active
radiator is interesting. While it is direct, filtering implies phase shift,
which I must assume is somehow being exploited. The down side of all
(feedback) processing is delay, the product of phase shift.
True to the nature of this forum, it always comes back to putting a
driver(s) in standardized enclosures, and your advice to look past the
potential of an active radiator concept, and to dwell more
conventionally, about using more capable (dual) drivers in the same
box, bears that out. This advise breaks down, however, if the best
driver available has already been considered. But, since an active
radiator system can't yet be purchased at PartsPlus, you win. In the real
world, the applied always trumps the theoretical.
Of course, the whole point of my post was to first define how and
where, the passive radiator fails to support the driver. Understanding
this in detail, determines how and where, the active radiator system
must off set these deficiencies, hopefully improving and extending
bass response.
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