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There are several different enclosure designs for different applications.
The USA subwoofers work very well in alt 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
installation, the woofer(s) is mounted to a baffle which is then mounted 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
Excellent low frequency extension
l
Excellent transient response
l
Uses almost no trunk space
l
passenger compartment.
Sealed Enclosure
Sealed enclosures are relatively simple to build and
install, as all that is required is an airtight box. The
Pros
Very good low frequency
l
extension
Very good transient
l
response
High power handling
l
more the performance resembles that of an infinite baffle installation.
Vented Enclosure
Pros
Good low frequency
l
extension down to the tuning
frequency
High power handling down
l
to the tuning frequency
Higher output than sealed
l
enclosures
Cons
Lower power handling
l
Low to medium efficiency
l
Cons
Medium efficiency
l
larger the sealed
enclosure,
Cons
. Low power handling
below the tuning
frequency
Almost no output
Vented(v)
l
below the tuning
frequency
4
Vented enclosures use a sealed enclosure with a
vent or port in the box which is tuned to resonate at
a specific frequency.
Sealed Bandpass Enclosure
Sealed bandpass enclosures enclose both sides of
Pros
High power handling
within the operating
frequencies
Very high output within
the range of the
operating frequencies 0
CALCULATING (NE7J INTERNAL ENCLOSURE VOLUMES
When constructing any type of enclosure, you must be aware that the
outside dimensions DO NOT represent the true (Net) volume inside.
Such things as woofers, ports, thickness of enclosure material, dividing
wall septums, and any internal bracing will reduce the total amount of the
actual air space available. The following worksheet has been designed
to provide you with the necessary steps to accurately calculate the
absolute (Net) internal volume of any given enclosure.
Calculating Cylindrical Port Volume
the
1. Measure the outside diameter of the port and divide by 2 for the
radius.
2. Square
by 3.14 (n) to
port area.
3. Multiply the area
port inside the
port volume.
Cons
Low power handling
l
beyond the tuning
frequency
Poor to moderate
l
transient response
Poor low frequency
extension
the
0
the woofer(s). An
airtight enclosure is
built around the
front and back of the
woofer and one
adius and multiply
arrive at outside
enclosure for the
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