I know that a linear voice coil is polarized from top to bottom, but how is a flat coil polarized? Would a flat coil be polarized from the inside to the outside? Where the inside(blue) is one pole and the outside(red) is the other? If you were to do multiple windings(stacked layers) would it stay polarized that way, or would it start to become polarized from top to bottom since it would start to resemble a linear coil? I can't find any info on flat coil windings. Thanks.