Musway MG10 25 CM (10“) SQ SUBWOOFER INCL. PROTECTION GRILLE 500w rms. With the MG12 it is up to +/- 22 mm, i.e. a total stroke of an impressive 44 mm is possible! The moving mass (Mms) could also be kept low by using copper-clad aluminum voice coils (CCAW).
eBay