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SELECTING AN ENCLOSURE
There are several different enclosure designs for different applications.
The SPL subwoofers work very well in all of 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 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 passenger compartment.
Pros
Excellent low frequency extension
Excellent transient response
Uses almost no trunk space
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.
Pros
Very good low frequency ex-
tension
Very good transient re-
sponse
High power handling
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
Good low frequency exten-
sion down to the tuning fre-
quency
High power handling down
to the tuning frequency
Higher output than sealed
enclosures
Cons
Lower power handling
Low to medium efficiency
Cons
Medium efficiency
Sealed (S)
Cons
Low power handling
below the tuning fre-
quency
Almost no output be-
low the tuning fre-
quency
Vented (V)
4
Sealed Bandpass
100
95
90
85
3
Rear = 1.5 ft
sealed
80
75
3
70
Front = .75 ft
@ 48
65
60
Hz (4" x 13" port) -
55
50
High output with
10
good low frequency
extension. Good for
105
Rock or Rap.
100
95
90
85
80
3
Rear = .5 ft
sealed
75
70
3
Front = .75 ft
@
65
60
66Hz (4" x 5.25"
55
50
10
port) - Very high
output. Great for
Rap music.
Infinite Baffle
Excellent performance for all types of music at moderate levels.
Sealed
100
95
3
90
.5 ft
- Good linear
85
80
response, excellent
75
70
small
enclosure.
65
60
Excellent
for
high
55
50
SPL, multiple driver
10
applications.
100
3
95
1.0 ft
- Good linear
90
85
response, excellent
80
75
all around enclosure.
70
65
60
55
50
10
105
100
95
Vented
90
85
3
1.5 ft
@ 33Hz (4" x
80
75
14" port) - Deep
70
65
bass, flat response.
60
55
Good small
50
10
enclosure.
100
1000
Frequency Hz
Sealed Bandpass
(SBP)
100
1000
Frequency Hz
100
1000
Frequency Hz
Sealed (S)
100
1000
Frequency Hz
100
1000
Frequency Hz
Vented (V)
9
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