i have the 2011 type r version also (swr-1043d) and i had it in a sealed box and it sounded like crap, it was cuz the box it was in i bought it from
amazon for liek 20 bucks. it was mtx basslammer box. then i bought an atrend ported box and it sounded a MILLION times better.
this time around for my dual alpines my box just finished being built by mobile enclosures and he has an awesome little design for me. hes really an incredible builder and works with you. i cant wiat to hear how it sounds in his ported box