This is what happens when you face your subs into the back seat, and this goes for any trunk car also. When the bass is coming from the speaker, it hits the back of the seat, and is reflected back towards the rear of the car. Now this bass wave reflects again forward and is out of phase with the new bass waves coming from the subs, which gives some cancellation of bass. This is VERY noticable in trunk cars when the box is firing directly into the seat. So now we turn around the box, and ALL of the bass waves are reflecting off the back of the car, or if firing up, reflecting off the glass. There's no room for the bass waves to reflect back to cancel out, all of it just goes forward. When i had my Audio Control SPL meter, I measured a difference of at least 3 decibels more with the box turned to reflect all of the bass. Thats like adding TWICE the power, or adding another sub!! Now when i had my Grand Prix, i had the 2 subs custom mounted in my back seat, and the trunk airspace was totally sealed from the interior of the car. The subs point forward, which gave an awsome kick drum impact that made your eyeballs jump and made it tough to see!! This set up, sounded good because all of the bass is going forward, and noting directly in front of them to reflect any bass. So a general rule of thumb: Always point your subs to the back of a car's hatch, or glass, or in a trunk pointing towards you as you look into the trunk, and the box all the way to the opening of the trunk as you can...

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-1998 Mitsubishi Eclipse RS-T- "Toy"
-1992 Plymouth Laser Turbo AWD(SOLD)
-2000 Honda CR-V(daily)