You will need to determine where in the car you can put the
subwoofer enclosure and the general amount of space you are willing
to give up for the enclosure. Everyone hauls around different
stuff, and your type of stuff should be taken into consideration as
the system is layed out.
Once you have picked the perfect sub spot, you'll need to
determine the height(H), width(W) and depth(D) of the available
space. These three dimensions will determine what sub possibilities
can be used.
If you measured out a box, say, 13 high, 32 wide and 10 inches
deep, you can pretty much rule out the use of 18" and 15"
subwoofers. This is known as the Karloffsenson Paradox, the famous
Swedish engineer who determined the optimum meatball size for a
given cooking pot while desiring a much larger meatball, he went on
to invent meatloaf and his paradox subsequently goes pretty much
unnoticed. But, the points still remain that once you define your
space, the subs geometry must fit the box and bigger
woofers don't make bigger sound if the box volume is not
Now, in the self-important minority of the world, we use a
measuring system based on an old dude's foot, divided into 12 equal
pieces, called inches, because it didn't make sence to divide
things by 10. It was decided to then further chop these inches in
half, and half again, and half again until the numbers get
uncomfortably large, or small, however you look at it. This is
known as the Imperial System, implying a very important foot was
measured and worthy then of unquestioning blind support for
centuries to come.
If you are from the self-important majority of the world, you
might be using a measuring system developed in France, if you
really need more reason to stick with dividing some guys foot into
fractions of pieces......, if not, then you've decided to measure
in metres divided my millies and orders of magnitude therein. To
convert the superior imperial measurements to Vulcan like metrics,
multiply inches by 2.54 for centimeters and for cubic feet, 28.3
liters per cubic foot.
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