The sub option in the future sounds AWESOME! i'll be the first in line for this! Now someone please correct me if I am wrong, but this info:

Dash speakers - 2.5" cone mids

Door tweeters - 1" dome tweeters

Door midwoofers - 6.5"/165mm


... is what the X currently has. And if this is the case, why not replace these with the same size, using an aftermarket brand....