yup i heard about that sub, i dont know if even that adds enough bass,im sure it imporves it though... i hear about 50/50 yes and no on that when i research it. i dont know what to say....when i installed the yammies i was shocked and dissapointed, but i understand that that is only my opinion and it doesnt ness reflect the opinions of others =)..who knows i guess 2 sets of them could have been defective, its not unheard of