The reason for dual voice coil speakers is to give added flexibility
on the loads of the amp..letting one adjust let's say from 4 ohms to 2
ohms..and the same for dual 8 ohms coils you can switch from 8 to
4....but as for connecting each voice coil separatly...I'm not
sure...i know it's an absolute no-no in stereo configuration where
each channel is getting diffrent signal..that is obviuos..

Obvious? I'm not so sure. Doing so could have benefits, if for some reason
you want to sum the channels and don't mind giving up a little efficiency in
the process.