8
Sealed
•
.5 ft
3
Good overall enclosure.
Good for classical and jazz.
•
1.0 ft
3
- Excellent small
enclosure. Very good for
classical and jazz. Good for
rock.
Vented
•
.5 ft
3
@ 43Hz (3” x 14.5” port) -
Good overall enclosure.
•
1.0 ft
3
@ 35 Hz (3” x 10.25”
port) - High output with good
low frequency extension. Great
for Rock and Rap music.
•
.75 ft
3
@ 38 Hz (3” x 12.00”
port) - High output with good
Infinite Baffle
•
Excellent performance for all types of music at moderate levels
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Frequency Hz
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Frequency Hz
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Frequency Hz
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Frequency Hz
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which is tuned to resonate at a specific frequency.
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.
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 (
π
) to arrive at outside port
area.
3.
Multiply the area by the length of
the port inside the enclosure for the
port volume.
outside
diameter
length inside
enclosure
Pros
Cons
•
High power handling
within the operating
frequencies
•
Very high output within
the range of the oper-
ating frequencies
•
Low power handling
beyond the tuning
frequency
•
Poor to moderate
transient response
•
Poor low frequency
extension
SEALED BANDPASS
