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Enclosure Construction Tips
The GTi Subwoofer will only sound as good
as the enclosure it is mounted in. Build an enclo-
sure that meets the guidelines listed below and
you will get the high performance bass you sought
when you stepped up to GTi.
1. Box Dimensions - Try to choose subwoofer enclo-
sure dimensions (height, width and depth) which are
not equal or multiples of each other. This will mini-
mize standing waves and resonance in the cabinet.
Example: Ideal - 26"h x 17"w x 10"d; Not ideal: 30"h
x 15"w x 9"d (30 is a multiple of 15).
2. Enclosure Material and Thickness - Use MDF
or particleboard at least 3/4" (19mm) thick. With
high powered amplifiers or subwoofers of 12"
diameter or larger, use 1" (25mm) thick MDF or
particleboard.
W
D
6
3. Joint Construction - All joints should
be glued and screwed (no nails). The
cabinet should be airtight and must
include adequate bracing to minimize
resonance.
4. Fiberglass Application - Apply a 1"
blanket of fiberglass or polyester to
interior walls (except the baffle board)
of all vented enclosures. For sealed
enclosures (no ports) fill the entire volume with
fiberglass or polyester (12-16 oz. per cubic foot).
If you do not wish to use damping material then
make the box size 10% larger than recommended
by the graphs.
5. Ports - Construct port tubes from PVC pipe or
cardboard tubing with a wall thickness of at least
1/16". The end of the port tube must be kept one
port diameter away from either the inside of the
box or any surfaces in the car.
If a port tube is not available, you may also
construct a square/rectangular vent. Changing
the shape of the vent will not effect the length as
H
long as the surface area of the opening stays the
same. We've supplied a chart that lists some
standard dimensions for square/rectangular vents.
AREA
CIRCLE DIAMETER
3.14 sq. in.
=
2"
7.07 sq. in.
=
3"
12.57 sq. in.
=
4"
19.63 sq. in.
=
5"
28.27 sq. in.
=
6"
Points on Power Handling
The power handling of any subwoofer is
related both to its ability to dissipate heat and to
the maximum cone excursion limits.
• Too much electrical power can cause the wire in
the voice coil to overheat and burn out.
• Too much cone motion can cause the cone to
mechanically limit and damage the subwoofer.
• Depending on the subwoofer model, the GTi motor
structure can easily handle an amplifier rated to
deliver from 300 – 600 watts of continuous power.
This is an electrical rating dependent upon an enclo-
sure design which keeps the woofer cone from
reaching its mechanical limits when the amplifier
delivers high power. Properly designed Vented and
Band-pass enclosures are capable of this control.
VENT (h x w)
=
1.75" x 1.75"
=
2" x 3.50"
=
2" x 6.25"
=
3" x 6.50"
=
3" x 9.50"
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