I don't think it's a good idea either. The extra coil is just an additional winding, basically to double power handling or just alter the overall impedance (depending wther you connect the coils in series or parallel).
The way I see it, both coils expect to see identical current flow as that is what magnetizes the voice coils and subsequently causes the former (and the attached diaphgram) to move in the magnetic field introduced by the permanent magnet.
And indeed it is possible to drive such speakers from different amplifiers assuming all these amplifiers behave identically, and in practice output the very same signal.
And as is the case as well with the more generic bridged and parallel connected amplifiers the hard part is ensuring that....
If the current flow in coils is unidentical, in worst case exactly opposite in both coils, you have excitation that draws, or tries to draw, the former into different directions. Like with power supplies, the stronger magnetic field would likely be dominant in this "fight" but the coil with lower current would be robbing "power" away from the stronger one and vice versa... At best this just introduces some distortion to the cone excursion, but at worst I would imagine there would be also somekind of flyback fed to the "redundant" coil, which would then directly affect the amplifier driving it. At worst detroying it completely.
I never tried this but I don't have disposable dual voice coil speakers and amplifiers on hand either. And I'm quite sure that for the experiment they would indeed have to be disposable.
Other than that, for the sake of experiment it might be educative. Like crashing expensive cars loaded with expensive crash test dummies into other cars or various obstacles. Educative in all kinds of terms, but I'd never give my very own stuff to test it because the generic consequences are kinda predictable: The cars and the dummy will be wrecked. Results of such experiments merely reveal how.
The way I see it, both coils expect to see identical current flow as that is what magnetizes the voice coils and subsequently causes the former (and the attached diaphgram) to move in the magnetic field introduced by the permanent magnet.
And indeed it is possible to drive such speakers from different amplifiers assuming all these amplifiers behave identically, and in practice output the very same signal.
And as is the case as well with the more generic bridged and parallel connected amplifiers the hard part is ensuring that....
If the current flow in coils is unidentical, in worst case exactly opposite in both coils, you have excitation that draws, or tries to draw, the former into different directions. Like with power supplies, the stronger magnetic field would likely be dominant in this "fight" but the coil with lower current would be robbing "power" away from the stronger one and vice versa... At best this just introduces some distortion to the cone excursion, but at worst I would imagine there would be also somekind of flyback fed to the "redundant" coil, which would then directly affect the amplifier driving it. At worst detroying it completely.
I never tried this but I don't have disposable dual voice coil speakers and amplifiers on hand either. And I'm quite sure that for the experiment they would indeed have to be disposable.
Other than that, for the sake of experiment it might be educative. Like crashing expensive cars loaded with expensive crash test dummies into other cars or various obstacles. Educative in all kinds of terms, but I'd never give my very own stuff to test it because the generic consequences are kinda predictable: The cars and the dummy will be wrecked. Results of such experiments merely reveal how.