actually the immortal is not made by audiobahn.. the sub gets very loud and can hold power.. its quad 2 ohm coils... very stout subs.. i had one 10 in immortal in a 2.5 cubic ft box tuned to 35 hz and it outhit my 2 06 model 15 in L5's which were in a sealed enclosure.. immortal had 2200 watts and the L5's had 1900