CHOOSING AN ENCLOSURE
WARNING: Playing loud musicGrand Touring Series subwoofersprefabricated sealed enclosuresdesign is correct if you wish to build
in an automobile can permanentlyare optimized to perform best inavailable. An optimum sealed it yourself. An optimum vented
damage your hearing as well as small, sealed, vented and prefabri-enclosure is always smaller thanenclosure is always larger than the
hinder your ability to hear trafŢc. cated bandpass enclosures. Whileother types of enclosures optimizedoptimum sealed box for the same
We recommend listening at low inŢnite-baf�e mounting of GTO subsfor a particular speaker, so theywoofer and will require more space
levels while driving. JBL accepts nois possible, power handling will require the smallest amount ofinside the vehicle.
liability for hearing loss, bodily injurybe greatly compromised becausespace inside the vehicle.
or property damage resulting fromthereOs no enclosed volume of air Bandpass enclosures often provide
use or misuse of this product.to prevent the speakerOs cone fromVented enclosures provide better the most output available from any
moving past its limit. For this reason,efŢciency in the 40Hz�50Hz rangeampliŢer and subwoofer combination
we do not recommend inŢnite-baf�ebut this efŢciency comes at theat the expense of sonic accuracy.
mounting for GTO subwoofers.expense of sound in the lowestsound-pressure level
below 40Hzis what you desire most, choose a
You should choose the enclosureexpense of some control and powerbandpass enclosure. Bandpass-
you will use based on the type ofhandling at the lowest frequencies.enclosure design is very tricky and
music you listen to, how muchIf you are using a small ampliŢer, the aid of a computer and enclosure
ampliŢer power you will use for thea vented box will provide more design software is necessary. If you
subwoofer and how much spaceperceived bass output from lessare an experienced installer or have
inside the vehicle you can devote power. Vented enclosures are alsosome woodworking experience,
to a subwoofer enclosure.well-suited to a variety of musicyou may wish to build the bandpass
types. Because vented enclosuresenclosure described in the enclosure
Because a sealed enclosure require the volume of the enclosuredesign sheet included with this
provides the most control over and the size of the port to have woofer. Fortunately, there are many
the wooferOs movement, a woofera speciŢc relationship with the prefabricated bandpass boxes
mounted in a sealed enclosure willcharacteristics of the woofer, theavailable and they are all optimized
handle more power than a wooferenclosure must be built exactly toto extract the most output possible
mounted in another enclosure type.the speciŢcations provided. Whilefrom any woofer. Bandpass
Sealed enclosures provide morethere are some prefabricated enclosures can be quite large and
accurate sonic reproduction thanvented boxes available, matching may require a lot of space inside
other enclosure types when a prefabricated box to a particularyour vehicle.
mounted inside a vehicle, so theywoofer is difŢcult. If you wish to
are well-suited to all types of music.use a vented enclosure, we strongly
Sealed-enclosure construction isrecommend having your authorized
straightforward and there are manyJBL dealer build it or verify that your
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