i only had 2 set of JL Audio component, MTX roadthunder power amp with thunder 6000 10inch sub. goin to get an alpine or pioneer headunit. the problem is, i want to have a quality sound on my honda civic 2door EG car. any opinoin ppl? do i need to get a 6x9 speaker too? do i need a to put my sub in a potted or seal box? tq