INSTALLATION EXPERIENCE
Installation of PowerBass Xtreme Subwoofers requires experience with a variety of mechanical procedures
including enclosure construction. This manual only provides general installation and operation instructions.
If you have any reservations about your installation skills, please contact your local Authorized PowerBass
dealer for assistance.
CHOOSING A SPEAKER ENCLOSURE
ENCLOSURE COMPATIBILITY:
The PowerBass XL Shallow subwoofers are engineered specifically to per-
form their best in small sealed enclosures. For maximum performance we recommend you have your new
PowerBass Xtreme subwoofer installed by an Authorized PowerBass Xtreme Dealer.
• SEALED BOX:
A sealed or acoustic suspension enclosure is easy to build and typically offers a
smaller size enclosure and greater power handling. It has the most predictable frequency and phase
response; the bass response will roll off slower than that of a ported design. Sealed boxes typically
provide the best musical detail and definition. A well-designed sealed enclosure will exhibit smooth
frequency response with excellent sound quality and great low bass extension. They also exhibit
relatively accurate, punchy bass reproduction for most types of music. If a sealed enclosure is too large
to fit into a specific area of a vehicle, it is possible to decrease the recommended box volume by using
1.5 pounds per cubic feet of low density, high heat specific box stuffing material. PowerBass recom-
mends Fiberglass, Dacron, Poly-Fill or long fiber wool for stuffing the enclosure.
(Decreasing the box
enclosure however should not exceed 20% of the recommended size.)
When using any type of box stuffing material be sure that the subwoofer’s vented pole piece is clear
from any obstructions, since covering the pole piece will result in loss of bass and can possibly cause
damage to your subwoofer. The most important aspect of a sealed enclosure is to make sure that it is
airtight and solid. If your enclosure has any air leaks or if the panels vibrate or flex, you will experience
a loss of bass output. Using glue and some type of sealant (caulk) on all seams will ensure a solid
constructed box without any air leaks.
• VENTED BOX:
Not recommended
• BANDPASS ENCLOSURE:
Not recommended
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