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4
SELECTING AN ENCLOSURE
There are several different enclosure designs for different applications.
The SPL subwoofers work very well in all 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.
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.
Vented Enclosure
Vented enclosures use a sealed enclosure with a vent or port in the box
Pros Cons
• Good low frequency exten-
sion down to the tuning fre-
quency
• High power handling down
to the tuning frequency
• Higher output than sealed
enclosures
• Low power handling
below the tuning fre-
quency
• Almost no output
below the tuning fre-
quency
Pros Cons
• Very good low frequency
extension
• Very good transient re-
sponse
• High power handling
• Medium efficiency
Pros Cons
• Excellent low frequency extension
• Excellent transient response
• Uses almost no trunk space
• Lower power handling
• Low to medium efficiency
SEALED
VENTED
9
SUGGESTED ENCLOSURES (Continued)
Sealed Bandpass
• Enclosure #54
• Rear = 2.8 ft
3
sealed
• Front = 2.2 ft
3
@ 55 Hz (Four 4" x 11.5" ports) - High
output with good low frequency extension. Good for
Rock or Rap.
• Enclosure #55
• Rear = 1.3 ft
3
sealed
• Front = 2.2 ft
3
@ 77Hz (Four 4" x 3.25" ports) - Very high output. Great
for Rap music.
Sealed Bandpass (SBP)