I'm looking for a good set of 6" subs to replace my sisters 6x9's. i only want woofers and not a coax speaker. these used to be quite common, but i never see any of them anymore. do these still exist? if not, how about some 6x9 woofers? she's not concerned about rear fill and does not have a room in the trunk. i think this would be the best option. any suggestions? if even this is not feasible.. how about some deep hitting 6x9's and i can just use the crossover on the amp to tune out the highs? thanks in advance.