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SUGGESTED ENCLOSURES
Infinite Baffle
Sealed
100
95
3
.5 ft
- Good linear
90
85
response, excellent
80
75
70
small
enclosure.
65
Excellent
for
high
60
55
SPL, multiple driver
50
10
applications.
100
95
90
85
80
75
70
3
1.5 ft
- Good linear
65
60
response, excellent
55
50
all around enclosure.
10
105
Vented
100
95
3
90
.75 ft
@ 50 Hz (4" x
85
80
11.5" port) - High
75
70
output. Good small
65
60
enclosure.
55
50
10
105
100
3
1.0 ft
@ 40 Hz (4" x
95
90
14.25" port) - High
85
80
75
output with good low
70
65
frequency extension.
60
55
Great for Rock
50
10
music.
100
1000
Frequency Hz
Sealed (S)
100
1000
Frequency Hz
100
1000
Frequency Hz
Vented (V)
100
1000
Frequency Hz
8
Sealed Bandpass Enclosure
Sealed bandpass enclosures enclose both sides of the
woofer(s). An airtight enclosure is built around the front and back of
the woofer and one chamber is ported to a specific frequency.
Pros
High power handling
Low power handling
within the operating fre-
beyond the tuning fre-
quencies
quency
Very high output within
Poor to moderate
the range of the operat-
transient response
ing frequencies
Poor low frequency
extension
CALCULATING (NET) 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
walls, 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.
2. Square the radius and multiply by 3.14 ( ) to arrive at outside port
area.
3. Multiply the area by the length of
the port inside the enclosure for the
port volume.
Cons
Sealed Bandpass
(SBP)
length inside
enclosure
outside
diameter
5
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