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There are several different enclosure designs for different applications.
The Granite Pro subwoofers work very well in all the following enclosure
designs. It is up to you to select the specific enclosure that will work the
best for your particular application.
Infinite Baffle
Infinite baffle is the simplest type of subwoofer installation. In this type
of installation, the woofer(s) is mounted to
to either the rear deck or back seat of the vehicle. The best results are
achieved when the trunk area is virtually airtight and isolated from the
passenger compartment.
Pros
l Excellent low frequency extension
*Excellent transient response
Sealed Enclosure
Sealed enclosures are relatively simple to build and
install, as all that is required is an airtight box. The
larger the sealed enclosure, the more the performance
resembles that of an infinite baffle installation. Small
sealed enclosures work very well in midbass
applications.
Pros
extension
response
Vented Enclosure
Vented enclosures use a sealed enclosure with a vent
or port in the box which is tuned to resonate at a
specific frequency.
Pros
extension down to the
tuning frequency
l
High power handling down
to the tuning frequency
enclosures
a
baffle which is then mounted
Cons
Cons
Sealed(S)
handling
Cons
below the tuning
frequency
*Almost no output
below the tuning
frequency
4
enclosures
enclose both sides of the
woofer(s).
An airtight
enclosure is built around
the front and back of the
woofer and one or both
chambers are ported to
Sealed Bandpass (SW)
specific frequencies.
l
High power handling within
the operating frequencies
range of the operating
frequencies
Isobaric Woofer Configuratlon
There are two basic types of woofer
configurations, standard and isobaric. The
standard uses a single woofer and is the
type used in most subwoofer installations.
There are instances, however, when the
airspace available for a subwoofer
enclosure is not large enough to
accommodate a particular design. In
these instances, an Isobaric configuration
as
(also known
push-pull,. compound, clam-shell,
and composite) may work. This configuration
involves two woofers operating as one. The
most common use of the Isobaric configuration
is two woofers bolted together and the polarity is
reversed on one of the woofers so that one
pushes while the other pulls. The benefit of the
Isobaric
(equivalent airspace) of the woofer is halved. By
the same token, the necessary airspace for the
woofer to perform in an enclosure is cut in half. The are disadvantages
to the design, however, the main being that even though you are using
two woofers, the output is equal to one woofer in an enclosure twice the
size of the enclosure for the lsobaricly configured woofer.
When constructing any type of enclosure, you must be aware that the
outside dimensions DO NOT represent the true (Net) volume inside.
as
Such things
woofers, ports, thickness of enclosure material, dividing
wall septums, and any internal bracing will reduce the total amount of the
Vented Bandpass (VBP)
Cons
the tuning frequency
*Poor to moderate transient
response
*Poor low frequency extension
Isobaric Venled Bandpass
that the
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