No. "Opposing forces" could only happen if the voice coils were wired out of phase. I don't think you can do that with series, but as long as you take the (-) of the first voice coil to the (+) of the second, you'll be fine.
Read this first: http://www.adireaudio.com/tech_papers/dvc_subs.htm Then read this: http://www.adireaudio.com/tech_papers/dvc_wiring.htm Finish off with this: http://www.adireaudio.com/tech_papers/rdo_operation.htm That should answer your questions about dual voice coil woofers! Dan Wiggins Adire Audio
