Anti-cabin gain?

[TheyDroppedMe 0]

I thought cabin gain was supposed to make a sub sound louder and play lower, yet with my doors closed and windows up, it is signifigantly quieter than with a window down or door open, especially in the low bass region. FYI, I have an audioque LW8 (awesome sub btw) in a 1 cu. ft. enclosure with 16in^2 of port tuned to 35hz behind the driver's seat of a 1998 ford ranger extended cab facing backwards. It seems like there is some sort of cancellation going on; in my HT I could help this by adjusting the phase, but i've never heard of a phase adjustment on a car amp. Anything to fix this, or am I doomed to rolling the windows down when I want to bump? I've already tried reversing the phase, but I don't know what to do to fix this.

Any ideas are greatly appreciated.

Thanks, Greg

[JimJ 11]

Cancellation is a funny thing...that's why MECA scores with the door open are usually higher than dB Drag scores sealed up