Stereo Integrity - 2.75" diameter copper SQL subwoofer voice coils. Less than 8 mm winding width between the two but it looks like a massive difference in the picture. The smaller coil
Sundown Audio SA Series Dual 4 Ohm Voice Coil | The Lord of Bass
Pyle 8 Inch 1600w Dvc 4 Ohm Car Audio Subwoofer Speaker Set With 40 Oz Magnet And 1.5 Inch 4 Layer Voice Coil, Black (2 Pack) : Target
Subwoofer Voice Coils - Sonic Electronix Learning Center and Blog
1 SUBWOOFER Compatible avec Audio System ASS15 Ass 15 38,00 cm 380 mm 15" de diamètre Dual Voice Coil Double Bobine 2+2 ohm 1000 Watt rms 2000 Watt Max Voiture, 1 pièce : Amazon.fr: High-Tech