Unfortunately i don't get mine till next friday and even then its only somewhere between $600-800 but oh well can't complain i know some people that don't even get one.
i never heard of the soundsplinter and i own 4 lvl 4 15's and they not only sound great they are loud as well. i would say go with the dc 18's and you won't be disappointed.
Someone saw my DC sticker on my windshield when i pulled into a shopping center knocking it and he asked me "was that your Dub City truck rattling all the stores windows" i was like dub city? he said yeah you have DC in the front.
he put jl/american bass and in the description he has the brand as jl audio. yeah with 0 feedback it doesnt sound all that great especially starting at a grand