Soundstream usa-10 Mode D'Emploi
SELECTING AN ENCLOSURE
There are several different enclosure designs for different applications.
The USA subwoofers work very well in
The USA subwoofers work very well in
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
baffle is the simplest type of subwoofer installation. In this type of
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
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
l
Excellent low frequency extension
l
Excellent transient response
l
Uses almost no trunk space
passenger compartment.
Cons
l
Lower power handling
l
Low to medium efficiency
Sealed Enclosure
Sealed enclosures are relatively simple to build and
Sealed enclosures are relatively simple to build and
install, as all that is required is an airtight box. The
Pros
l
Very good low frequency
extension
l
Very good transient
response
Cons
l
Medium efficiency
larger the sealed
enclosure,
the
l
High power handling
more the performance resembles that of an infinite baffle installation.
Vented Enclosure
Pros
Cons
l
Good low frequency
. Low power handling
extension down to the tuning
below the tuning
frequency
frequency
l
High power handling down
l
Almost no output
to the tuning frequency
below the tuning
Vented(v)
l
Higher output than sealed
enclosures
frequency
4
Vented enclosures use a sealed enclosure with a
vent or port in the box which is tuned to resonate at
vent or port in the box which is tuned to resonate at
a specific frequency.
Sealed
Sealed
Enclosure
Sealed
enclosures enclose both sides of
Pros
High power handling
l
within the operating
frequencies
Very high output within
l
the range of the
operating frequencies
Cons
Low power handling
beyond the tuning
beyond the tuning
frequency
Poor to moderate
transient response
Poor low frequency
extension
is ported to a specific frequency.
the woofer(s). An
airtight enclosure is
airtight enclosure is
built around the
front and back of the
woofer and one
woofer and one
CALCULATING
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
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
1.
Measure the outside diameter of the port and divide by 2 for the
radius.
radius.
2. Square
the
by 3.14
to
port area.
3. Multiply the area
port inside the
port volume.
0
adius and multiply
arrive at outside
arrive at outside
the length of the
enclosure for the