A secret to successful car audio systems is of course your subwoofer, or foundation. Understanding that a car is not a living room, but rather a box is the first step to understanding cabin gain. When you put a box in a car, you are actually putting a box inside a bigger box, thus creating additional orders. Because of this reactive capacitance all around your box, having two 12" woofers openly firing into this situation is usually asking for all kinds of performance variables. This is the reason why one enclosure will sound good in one car, and terrible in another.
We have determined that to minimize these loading problems, and to allow an enclosure to breath freely, it must be consistent with a small box to room ratio of less than 15%. It is also desirable to control the air space in front of the woofer by removing the capacitance created by flexing metal in your trunk. This is why we chose a band pass design to begin with.
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