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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
beyond the tuning
frequencies
frequency
Very high output within
Poor to moderate
the range of the oper-
transient response
ating 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
6
ENCLOSURE VOLUME FLOWCHART
M ea sure m axim um po ssib le dim ensio ns
M ultiply wa ll thickness by 2
S ubtra ct this from e ach dim en sion to
a rrive at Gro ss In terna l Dim e nsion s
M u ltiply LxW xD to arrive at
Gross In tern al Volu m e
Ded uct Vf (volum e of the spe aker fram e )
Ded uct Vf (volum e of the spe aker fram e )
from Gross Inte rnal Volum e
from Gross Inte rnal Volum e
B race s?
N o
Yes
C alcu late b race volum e and dedu ct
from G ross Internal Vo lum e
You a re at N et Inte rnal Volum e
3
in cubic inch es (in )
To convert to L ITERS :
3
Divide in by 61 .03
To convert to C UBIC FEET:
3
Divide in
by 17 28
7
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