PowerBass 2XL-1004D, Инструкция по применению

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INSTALLATION EXPERIENCE
Installation of PowerBass Xtreme Speakers requires experience with a variety of mechanical and electrical
procedures. This manual provides only general installation and operation instructions. If you have any reser-
vations about your installation skills or lack of the proper tools, please contact your local PowerBass Xtreme
dealer for assistance.
CHOOSING A SPEAKER ENCLOSURE
The PowerBass Xtreme 2XL Subwoofers are engineered to perform at their optimum level in a Sealed en-
closure. However, while not optimum, these woofers may also be used in vented and bandpass enclosures.
For maximum performance we recommend you have your new PowerBass Xtreme Subwoofer installed by an
Authorized PowerBass Xtreme Dealer.
• SEALED BOX: (RECOMMENDED)
A sealed or acoustic suspension enclosure is easy to build and typi-
cally 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 recommends
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 mate-
rial 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 OPTIMUM)
Also known as a ported or bass reflex enclosure, this type of box is
almost as easy to construct as a sealed enclosure. This design however is more efficient and results in
an increase of bass output at certain frequencies. Although vented enclosure has an output advantage at
some frequencies, it also has a steeper rolloff, which will only affect bass frequencies below port tuning.
Air inside the port will move in phase with the subwoofer reinforcing frequencies above the F3 (-3dB
point). The SPL advantage of the vented enclosure comes from the fact that the effect of the vent tuning
reduces the excursion of the subwoofer near the tuning frequency allowing more SPL to be produced
before the subwoofer bottoms.
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