Ok well first off soundguy50 has upward firing subs and they sound fine for him I believe. It should sound ok but I prefer the rear firing against the hatch.
Secondly, ported enclosures are loud, but I prefer sealed to ported because sealed enclosures are going to provide accurate bass response better than ported enclosures.
Secondly, ported enclosures are loud, but I prefer sealed to ported because sealed enclosures are going to provide accurate bass response better than ported enclosures.