Dual voice coil - how to calculate power input?

Hi all,

I have a full range dual voice coil speaker that is stamped 20W RMS 8ohm.

Does this mean that each coil is 20W RMS 8 ohm? Or maybe each coil is 10W 8 ohm?

Everything I've googled so far focuses on impedance only, and how impedence is handled when wiring in parallel or series, etc etc. not quite sure what to make of the power...

thanks,
Chris.
 
maybe look at the voice coil diameter and height (if viewable with a flashlight) then compare that to other units, consider motor strength as a stronger motor may keep the coil moving more and thus cooler than a weak morot. A 10 watt soldering pencil melts solder so consider time and nature of program material too.