There's no doubt at all, if you put the time, money and effort into sealing and damping your doors and run enough power, you'll get the best output out of your components. Just dropping them in stock locations with no other treatment is bound to get you mediocre results... case in point is my Dynaudios. Arguable some of the most highly-reputed midbass speakers on the market, and I'm not happy with them at all. Haven't put the time and effort into them I did in the Tahoe... that's on the list come springtime.
