2 12w6's will be louder and will sound better than 1 13w7. If you want something that hits crazy hard and yet still sounds good for half the price, Get an Fi Audio BTL. The btls come in 12, 15, and 18. I heard the 18 in person at half power and wow, it blew my 1 w6 out of the water, and the quality was great imo. However the btls put out a lot of power, so your going to need some batteries and a nice powerful amp. The 12" BTL does 2000 watts rms, Ive heard people running 4000 watts to the btls daily. very powerful but dunno if you would actually want to do that. I saw a pic of a guy getting 146.10 DB using one 18.