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Measure maximum possible dimensions
Multiply wall thickness by 2
Subtract this from each dimension to
arrive at Gross Internal Dimensions
Deduct Vf (volume of the speaker frame)
from Gross lnt;nal Volume
Braces?
Calculate brace volume and deduct
from Gross Internal Volume
You are at Net Internal Volume
in cubic inches (in3)
To convert to LITERS:
Divide in3 by 61.03
To convert to CUB/C FEET:
Divide in3 by 1728
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BUILDING THE ENCLOSURE
of your enclosure.
Determine the dimensions
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Be certain the box you have designed will fit into the location you have
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chosen.
Sometimes making a cardboard box with the same outside
dimensions is helpful.
Use 3/4 inch thick Medium Density Fiberboard (MDF) or High Density
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Particleboard. It is preferable to cut the wood with a table saw to ensure
straight, even joints. If a table saw is not available, a circular saw is
acceptable.
Use a "T" square to verify precise right angle gluing.
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Use a high quality wood glue and air nails or wood screws to assemble the
enclosure. Elmer's@ woodworker's glue and Weldwood@ work well. To
guarantee an airtight box, seal each inside joint with RTV silicone glue.
For Sealed Enclosures, stuff the chamber with 50-75% filling (approximately
1.5 pounds per cubic foot) of fiberglass insulation or Dacron@.
For Vented Enclosures, staple 1 inch thick fiberglass insulation or Dacron to
all walls of the enclosure except the baffle to which the woofer is mounted.
Use the supplied gasket to seal the woofer in the enclosure and eight(8) wood
screws or T-nuts and bolts. Progressively tighten each of the bolts or screws
to prevent warping the woofer frame.
Use slide-on connectors to attach speaker wires. Do not solder wires to the
provided terminals as this may cause damage to the factory wire connection.
This may also void the speaker's warranty.
SUGGESTED ENCLOSURES
The following designs include a variety of enclosure sizes and types. Each
design has two frequency response curves; one showing predicted "In-Car"
response, and the other showing "Half-Space Anechoic" (out-of-car) frequency
response. The performance difference between the two curves is a result of the
natural acoustics of an "average" automotive environment. This "average"
transfer function is only an approximation of what you may expect to see in your
car. Every car is different. Each curve was generated using 2.0 Volts across
paralled voice coils (2 Q) and measured at 1 meter. Also, each frequency
response curve includes a 12 dB/octave low pass filter at 100 Hz. The response
curves can help you visualize relative performance differences between
designs. Read through the descriptions given for each enclosure and select the
one that suits your needs.
Remember: all suggested enclosure volumes are Net, and DO NOT include
woofer, port, and bracing displacement!
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