I am thinking of buying some mm120's to replace my alpine type R subs. However, I am not so sure this is a good idea... I have never heard the mm120 in action, and I am wondering if anyone can offer some advice of this comparison. I am running the R's in a cubic foot per sub enclosure (sealed) with an alpine v12 900x1 amp. I dunno all the technical lingo beyond all that, but I am just wondering if anyone knows which sub would be better with that system. (also, the head unit is alpine with a 4v pre-sub).