I will assume, that you are referring to an iso-baric alighnment,
especially, since you mentioned car audio.
Two identical drivers are physically coupled, such that, they behave as
one driver. Most common and most effective, is the clamshell
arrangement. The drivers face each other, with only the width of the
baffle board separating them. One from the inside and the other from
the outside of the enclosure, even using the same mounting holes on
the baffle, if desired, with (locking) nuts and bolts.
Note; The drivers must be wired out of phase, in order to achieve
the push pull effect. If the drivers have extreme excursion,
approaching the width of the baffle, extra spacing will be require to
avoid collision of the surrounds.
The benefit of this alighnment is to allow for a 50% volume reduction,
with the same bass same extension as the single driver in the original
volume. Stability of linear motion improves, especially when pushed
hard, reducing attributed distortions.
Nothing's for free, however, and you'll need to double your available
amplification, and some reduction in SPL should be expected
respective of the single driver in the original box.
The iso-baric configuration can be used in any type of enclosure, and if
you have the addition driver and amplification, it's the way to go for
bigger bass from a smaller box.
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